The mmu code is almost not platform specific. Copy it to arch/m68k for now.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38910 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol
@@ -0,0 +1,682 @@
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/*
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* Copyright 2004-2007, Axel Dörfler, [email protected].
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* Based on code written by Travis Geiselbrecht for NewOS.
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*
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* Distributed under the terms of the MIT License.
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*/
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#include "atari_memory_map.h"
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#include "toscalls.h"
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#include "mmu.h"
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#include <boot/platform.h>
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#include <boot/stdio.h>
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#include <boot/kernel_args.h>
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#include <boot/stage2.h>
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#include <arch/cpu.h>
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#include <arch_kernel.h>
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#include <kernel.h>
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#include <OS.h>
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#include <string.h>
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//XXX: x86
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/** The (physical) memory layout of the boot loader is currently as follows:
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* 0x0500 - 0x10000 protected mode stack
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* 0x0500 - 0x09000 real mode stack
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* 0x10000 - ? code (up to ~500 kB)
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* 0x90000 1st temporary page table (identity maps 0-4 MB)
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* 0x91000 2nd (4-8 MB)
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* 0x92000 - 0x92000 further page tables
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* 0x9e000 - 0xa0000 SMP trampoline code
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* [0xa0000 - 0x100000 BIOS/ROM/reserved area]
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* 0x100000 page directory
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* ... boot loader heap (32 kB)
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* ... free physical memory
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*
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* The first 8 MB are identity mapped (0x0 - 0x0800000); paging is turned
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* on. The kernel is mapped at 0x80000000, all other stuff mapped by the
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* loader (kernel args, modules, driver settings, ...) comes after
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* 0x81000000 which means that there is currently only 1 MB reserved for
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* the kernel itself (see kMaxKernelSize).
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*/
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// notes m68k:
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/** The (physical) memory layout of the boot loader is currently as follows:
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* 0x0800 - 0x10000 supervisor mode stack (1) XXX: more ? x86 starts at 500
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* 0x10000 - ? code (up to ~500 kB)
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* 0x100000 or FAST_RAM_BASE if any:
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* ... page root directory
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* ... interrupt vectors (VBR)
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* ... page directory
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* ... boot loader heap (32 kB)
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* ... free physical memory
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* 0xdNNNNN video buffer usually there, as per v_bas_ad
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* (=Logbase() but Physbase() is better)
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*
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* The first 32 MB (2) are identity mapped (0x0 - 0x1000000); paging
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* is turned on. The kernel is mapped at 0x80000000, all other stuff
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* mapped by the loader (kernel args, modules, driver settings, ...)
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* comes after 0x81000000 which means that there is currently only
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* 1 MB reserved for the kernel itself (see kMaxKernelSize).
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*
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* (1) no need for user stack, we are already in supervisor mode in the
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* loader.
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* (2) maps the whole regular ST space; transparent translation registers
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* have larger granularity anyway.
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*/
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#warning M68K: check for Physbase() < ST_RAM_TOP
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//#define TRACE_MMU
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#ifdef TRACE_MMU
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# define TRACE(x) dprintf x
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#else
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# define TRACE(x) ;
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#endif
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// since the page root directory doesn't take a full page (1k)
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// we stuff some other stuff after it, like the interrupt vectors (1k)
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#define VBR_PAGE_OFFSET 1024
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static const uint32 kDefaultPageTableFlags = 0x07; // present, user, R/W
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static const size_t kMaxKernelSize = 0x100000; // 1 MB for the kernel
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// working page directory and page table
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addr_t gPageRoot = 0;
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static addr_t sNextPhysicalAddress = 0x100000;
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static addr_t sNextVirtualAddress = KERNEL_BASE + kMaxKernelSize;
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static addr_t sMaxVirtualAddress = KERNEL_BASE /*+ 0x400000*/;
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#if 0
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static addr_t sNextPageTableAddress = 0x90000;
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static const uint32 kPageTableRegionEnd = 0x9e000;
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// we need to reserve 2 pages for the SMP trampoline code XXX:no
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#endif
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static const struct boot_mmu_ops *gMMUOps;
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static addr_t
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get_next_virtual_address(size_t size)
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{
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addr_t address = sNextVirtualAddress;
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sNextVirtualAddress += size;
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TRACE(("%s(%d): %08x\n", __FUNCTION__, size, address));
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return address;
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}
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static addr_t
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get_next_physical_address(size_t size)
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{
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addr_t address = sNextPhysicalAddress;
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sNextPhysicalAddress += size;
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TRACE(("%s(%d): %08x\n", __FUNCTION__, size, address));
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return address;
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}
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static addr_t
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get_next_virtual_page()
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{
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TRACE(("%s\n", __FUNCTION__));
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return get_next_virtual_address(B_PAGE_SIZE);
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}
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static addr_t
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get_next_physical_page()
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{
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TRACE(("%s\n", __FUNCTION__));
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return get_next_physical_address(B_PAGE_SIZE);
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}
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// allocate a page worth of page dir or tables
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extern "C" addr_t
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mmu_get_next_page_tables()
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{
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#if 0
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TRACE(("mmu_get_next_page_tables, sNextPageTableAddress %p, kPageTableRegionEnd %p\n",
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sNextPageTableAddress, kPageTableRegionEnd));
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addr_t address = sNextPageTableAddress;
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if (address >= kPageTableRegionEnd)
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return (uint32 *)get_next_physical_page();
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sNextPageTableAddress += B_PAGE_SIZE;
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return (uint32 *)address;
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#endif
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addr_t tbl = get_next_physical_page();
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if (!tbl)
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return tbl;
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// shouldn't we fill this ?
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//gKernelArgs.arch_args.pgtables[gKernelArgs.arch_args.num_pgtables++] = (uint32)pageTable;
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#if 0
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// clear them
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uint32 *p = (uint32 *)tbl;
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for (int32 i = 0; i < 1024; i++)
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p[i] = 0;
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#endif
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return tbl;
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}
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#if 0
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/** Adds a new page table for the specified base address */
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static void
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add_page_table(addr_t base)
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{
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TRACE(("add_page_table(base = %p)\n", (void *)base));
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#if 0
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// Get new page table and clear it out
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uint32 *pageTable = mmu_get_next_page_tables();
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if (pageTable > (uint32 *)(8 * 1024 * 1024))
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panic("tried to add page table beyond the indentity mapped 8 MB region\n");
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gKernelArgs.arch_args.pgtables[gKernelArgs.arch_args.num_pgtables++] = (uint32)pageTable;
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for (int32 i = 0; i < 1024; i++)
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pageTable[i] = 0;
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// put the new page table into the page directory
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gPageRoot[base/(4*1024*1024)] = (uint32)pageTable | kDefaultPageTableFlags;
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#endif
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}
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#endif
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static void
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unmap_page(addr_t virtualAddress)
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{
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gMMUOps->unmap_page(virtualAddress);
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}
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/** Creates an entry to map the specified virtualAddress to the given
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* physicalAddress.
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* If the mapping goes beyond the current page table, it will allocate
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* a new one. If it cannot map the requested page, it panics.
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*/
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static void
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map_page(addr_t virtualAddress, addr_t physicalAddress, uint32 flags)
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{
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TRACE(("map_page: vaddr 0x%lx, paddr 0x%lx\n", virtualAddress, physicalAddress));
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if (virtualAddress < KERNEL_BASE)
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panic("map_page: asked to map invalid page %p!\n", (void *)virtualAddress);
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// slow but I'm too lazy to fix the code below
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gMMUOps->add_page_table(virtualAddress);
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#if 0
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if (virtualAddress >= sMaxVirtualAddress) {
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// we need to add a new page table
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gMMUOps->add_page_table(sMaxVirtualAddress);
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// 64 pages / page table
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sMaxVirtualAddress += B_PAGE_SIZE * 64;
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if (virtualAddress >= sMaxVirtualAddress)
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panic("map_page: asked to map a page to %p\n", (void *)virtualAddress);
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}
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#endif
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physicalAddress &= ~(B_PAGE_SIZE - 1);
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// map the page to the correct page table
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gMMUOps->map_page(virtualAddress, physicalAddress, flags);
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}
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static void
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init_page_directory(void)
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{
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TRACE(("init_page_directory\n"));
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// allocate a new pg root dir
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gPageRoot = get_next_physical_page();
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gKernelArgs.arch_args.phys_pgroot = (uint32)gPageRoot;
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gKernelArgs.arch_args.phys_vbr = (uint32)gPageRoot + VBR_PAGE_OFFSET;
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// set the root pointers
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gMMUOps->load_rp(gPageRoot);
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// allocate second level tables for kernel space
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// this will simplify mmu code a lot, and only wastes 32KB
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gMMUOps->allocate_kernel_pgdirs();
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// enable mmu translation
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gMMUOps->enable_paging();
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//XXX: check for errors
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//gKernelArgs.arch_args.num_pgtables = 0;
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gMMUOps->add_page_table(KERNEL_BASE);
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#if 0
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// clear out the pgdir
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for (int32 i = 0; i < 1024; i++) {
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gPageRoot[i] = 0;
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}
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// Identity map the first 8 MB of memory so that their
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// physical and virtual address are the same.
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// These page tables won't be taken over into the kernel.
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// make the first page table at the first free spot
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uint32 *pageTable = mmu_get_next_page_tables();
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for (int32 i = 0; i < 1024; i++) {
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pageTable[i] = (i * 0x1000) | kDefaultPageFlags;
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}
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gPageRoot[0] = (uint32)pageTable | kDefaultPageFlags;
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// make the second page table
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pageTable = mmu_get_next_page_tables();
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for (int32 i = 0; i < 1024; i++) {
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pageTable[i] = (i * 0x1000 + 0x400000) | kDefaultPageFlags;
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}
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gPageRoot[1] = (uint32)pageTable | kDefaultPageFlags;
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gKernelArgs.arch_args.num_pgtables = 0;
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add_page_table(KERNEL_BASE);
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// switch to the new pgdir and enable paging
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asm("movl %0, %%eax;"
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"movl %%eax, %%cr3;" : : "m" (gPageRoot) : "eax");
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// Important. Make sure supervisor threads can fault on read only pages...
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asm("movl %%eax, %%cr0" : : "a" ((1 << 31) | (1 << 16) | (1 << 5) | 1));
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#endif
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}
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// #pragma mark -
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extern "C" addr_t
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mmu_map_physical_memory(addr_t physicalAddress, size_t size, uint32 flags)
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{
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addr_t address = sNextVirtualAddress;
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addr_t pageOffset = physicalAddress & (B_PAGE_SIZE - 1);
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physicalAddress -= pageOffset;
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for (addr_t offset = 0; offset < size; offset += B_PAGE_SIZE) {
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map_page(get_next_virtual_page(), physicalAddress + offset, flags);
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}
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return address + pageOffset;
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}
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extern "C" void *
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mmu_allocate(void *virtualAddress, size_t size)
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{
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TRACE(("mmu_allocate: requested vaddr: %p, next free vaddr: 0x%lx, size: %ld\n",
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virtualAddress, sNextVirtualAddress, size));
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size = (size + B_PAGE_SIZE - 1) / B_PAGE_SIZE;
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// get number of pages to map
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if (virtualAddress != NULL) {
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// This special path is almost only useful for loading the
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// kernel into memory; it will only allow you to map the
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// 1 MB following the kernel base address.
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// Also, it won't check for already mapped addresses, so
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// you better know why you are here :)
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addr_t address = (addr_t)virtualAddress;
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// is the address within the valid range?
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if (address < KERNEL_BASE || address + size >= KERNEL_BASE + kMaxKernelSize)
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return NULL;
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for (uint32 i = 0; i < size; i++) {
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map_page(address, get_next_physical_page(), kDefaultPageFlags);
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address += B_PAGE_SIZE;
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}
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TRACE(("mmu_allocate(KERNEL, %d): done\n", size));
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return virtualAddress;
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}
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void *address = (void *)sNextVirtualAddress;
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for (uint32 i = 0; i < size; i++) {
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map_page(get_next_virtual_page(), get_next_physical_page(), kDefaultPageFlags);
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}
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TRACE(("mmu_allocate(NULL, %d): %p\n", size, address));
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return address;
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}
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/** This will unmap the allocated chunk of memory from the virtual
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* address space. It might not actually free memory (as its implementation
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* is very simple), but it might.
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*/
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extern "C" void
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mmu_free(void *virtualAddress, size_t size)
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{
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TRACE(("mmu_free(virtualAddress = %p, size: %ld)\n", virtualAddress, size));
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addr_t address = (addr_t)virtualAddress;
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size = (size + B_PAGE_SIZE - 1) / B_PAGE_SIZE;
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// get number of pages to map
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// is the address within the valid range?
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if (address < KERNEL_BASE
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|| address + size >= KERNEL_BASE + kMaxKernelSize) {
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panic("mmu_free: asked to unmap out of range region (%p, size %lx)\n",
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(void *)address, size);
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}
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// unmap all pages within the range
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for (uint32 i = 0; i < size; i++) {
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unmap_page(address);
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address += B_PAGE_SIZE;
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}
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if (address == sNextVirtualAddress) {
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// we can actually reuse the virtual address space
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sNextVirtualAddress -= size;
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}
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}
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/** Sets up the final and kernel accessible GDT and IDT tables.
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* BIOS calls won't work any longer after this function has
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* been called.
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*/
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extern "C" void
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mmu_init_for_kernel(void)
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{
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TRACE(("mmu_init_for_kernel\n"));
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// remove identity mapping of ST space
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// actually done by the kernel when it's done using query_early
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//gMMUOps->set_tt(0, NULL, 0, 0);
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#if 0
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// set up a new idt
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{
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struct gdt_idt_descr idtDescriptor;
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uint32 *idt;
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// find a new idt
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idt = (uint32 *)get_next_physical_page();
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gKernelArgs.arch_args.phys_idt = (uint32)idt;
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TRACE(("idt at %p\n", idt));
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// map the idt into virtual space
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gKernelArgs.arch_args.vir_idt = (uint32)get_next_virtual_page();
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map_page(gKernelArgs.arch_args.vir_idt, (uint32)idt, kDefaultPageFlags);
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// clear it out
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uint32* virtualIDT = (uint32*)gKernelArgs.arch_args.vir_idt;
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for (int32 i = 0; i < IDT_LIMIT / 4; i++) {
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virtualIDT[i] = 0;
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}
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// load the idt
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idtDescriptor.limit = IDT_LIMIT - 1;
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idtDescriptor.base = (uint32 *)gKernelArgs.arch_args.vir_idt;
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||||
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asm("lidt %0;"
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: : "m" (idtDescriptor));
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TRACE(("idt at virtual address 0x%lx\n", gKernelArgs.arch_args.vir_idt));
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}
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||||
// set up a new gdt
|
||||
{
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||||
struct gdt_idt_descr gdtDescriptor;
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segment_descriptor *gdt;
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||||
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||||
// find a new gdt
|
||||
gdt = (segment_descriptor *)get_next_physical_page();
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gKernelArgs.arch_args.phys_gdt = (uint32)gdt;
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TRACE(("gdt at %p\n", gdt));
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// map the gdt into virtual space
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gKernelArgs.arch_args.vir_gdt = (uint32)get_next_virtual_page();
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map_page(gKernelArgs.arch_args.vir_gdt, (uint32)gdt, kDefaultPageFlags);
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// put standard segment descriptors in it
|
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segment_descriptor* virtualGDT
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= (segment_descriptor*)gKernelArgs.arch_args.vir_gdt;
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||||
clear_segment_descriptor(&virtualGDT[0]);
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||||
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||||
// seg 0x08 - kernel 4GB code
|
||||
set_segment_descriptor(&virtualGDT[1], 0, 0xffffffff, DT_CODE_READABLE,
|
||||
DPL_KERNEL);
|
||||
|
||||
// seg 0x10 - kernel 4GB data
|
||||
set_segment_descriptor(&virtualGDT[2], 0, 0xffffffff, DT_DATA_WRITEABLE,
|
||||
DPL_KERNEL);
|
||||
|
||||
// seg 0x1b - ring 3 user 4GB code
|
||||
set_segment_descriptor(&virtualGDT[3], 0, 0xffffffff, DT_CODE_READABLE,
|
||||
DPL_USER);
|
||||
|
||||
// seg 0x23 - ring 3 user 4GB data
|
||||
set_segment_descriptor(&virtualGDT[4], 0, 0xffffffff, DT_DATA_WRITEABLE,
|
||||
DPL_USER);
|
||||
|
||||
// virtualGDT[5] and above will be filled later by the kernel
|
||||
// to contain the TSS descriptors, and for TLS (one for every CPU)
|
||||
|
||||
// load the GDT
|
||||
gdtDescriptor.limit = GDT_LIMIT - 1;
|
||||
gdtDescriptor.base = (uint32 *)gKernelArgs.arch_args.vir_gdt;
|
||||
|
||||
asm("lgdt %0;"
|
||||
: : "m" (gdtDescriptor));
|
||||
|
||||
TRACE(("gdt at virtual address %p\n", (void *)gKernelArgs.arch_args.vir_gdt));
|
||||
}
|
||||
#endif
|
||||
|
||||
// save the memory we've physically allocated
|
||||
gKernelArgs.physical_allocated_range[0].size = sNextPhysicalAddress - gKernelArgs.physical_allocated_range[0].start;
|
||||
|
||||
// save the memory we've virtually allocated (for the kernel and other stuff)
|
||||
gKernelArgs.virtual_allocated_range[0].start = KERNEL_BASE;
|
||||
gKernelArgs.virtual_allocated_range[0].size = sNextVirtualAddress - KERNEL_BASE;
|
||||
gKernelArgs.num_virtual_allocated_ranges = 1;
|
||||
|
||||
// sort the address ranges
|
||||
sort_physical_address_ranges(gKernelArgs.physical_memory_range,
|
||||
gKernelArgs.num_physical_memory_ranges);
|
||||
sort_physical_address_ranges(gKernelArgs.physical_allocated_range,
|
||||
gKernelArgs.num_physical_allocated_ranges);
|
||||
sort_address_ranges(gKernelArgs.virtual_allocated_range,
|
||||
gKernelArgs.num_virtual_allocated_ranges);
|
||||
|
||||
#ifdef TRACE_MMU
|
||||
{
|
||||
uint32 i;
|
||||
|
||||
dprintf("phys memory ranges:\n");
|
||||
for (i = 0; i < gKernelArgs.num_physical_memory_ranges; i++) {
|
||||
dprintf(" base 0x%08lx, length 0x%08lx\n", gKernelArgs.physical_memory_range[i].start, gKernelArgs.physical_memory_range[i].size);
|
||||
}
|
||||
|
||||
dprintf("allocated phys memory ranges:\n");
|
||||
for (i = 0; i < gKernelArgs.num_physical_allocated_ranges; i++) {
|
||||
dprintf(" base 0x%08lx, length 0x%08lx\n", gKernelArgs.physical_allocated_range[i].start, gKernelArgs.physical_allocated_range[i].size);
|
||||
}
|
||||
|
||||
dprintf("allocated virt memory ranges:\n");
|
||||
for (i = 0; i < gKernelArgs.num_virtual_allocated_ranges; i++) {
|
||||
dprintf(" base 0x%08lx, length 0x%08lx\n", gKernelArgs.virtual_allocated_range[i].start, gKernelArgs.virtual_allocated_range[i].size);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
extern "C" void
|
||||
mmu_init(void)
|
||||
{
|
||||
TRACE(("mmu_init\n"));
|
||||
switch (gKernelArgs.arch_args.mmu_type) {
|
||||
#if 0
|
||||
case 68851:
|
||||
gMMUOps = &k851MMUOps;
|
||||
break;
|
||||
#endif
|
||||
case 68030:
|
||||
gMMUOps = &k030MMUOps;
|
||||
break;
|
||||
case 68040:
|
||||
gMMUOps = &k040MMUOps;
|
||||
break;
|
||||
#if 0
|
||||
case 68060:
|
||||
gMMUOps = &k060MMUOps;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
panic("unknown mmu type %d\n", gKernelArgs.arch_args.mmu_type);
|
||||
}
|
||||
|
||||
gMMUOps->initialize();
|
||||
|
||||
addr_t fastram_top = 0;
|
||||
if (*TOSVARramvalid == TOSVARramvalid_MAGIC)
|
||||
fastram_top = *TOSVARramtop;
|
||||
if (fastram_top) {
|
||||
// we have some fastram, use it first
|
||||
sNextPhysicalAddress = ATARI_FASTRAM_BASE;
|
||||
}
|
||||
|
||||
gKernelArgs.physical_allocated_range[0].start = sNextPhysicalAddress;
|
||||
gKernelArgs.physical_allocated_range[0].size = 0;
|
||||
gKernelArgs.num_physical_allocated_ranges = 1;
|
||||
// remember the start of the allocated physical pages
|
||||
|
||||
// enable transparent translation of the first 256 MB
|
||||
gMMUOps->set_tt(0, ATARI_CHIPRAM_BASE, 0x10000000, 0);
|
||||
// enable transparent translation of the 16MB ST shadow range for I/O
|
||||
gMMUOps->set_tt(1, ATARI_SHADOW_BASE, 0x01000000, 0);
|
||||
|
||||
init_page_directory();
|
||||
#if 0//XXX:HOLE
|
||||
|
||||
// Map the page directory into kernel space at 0xffc00000-0xffffffff
|
||||
// this enables a mmu trick where the 4 MB region that this pgdir entry
|
||||
// represents now maps the 4MB of potential pagetables that the pgdir
|
||||
// points to. Thrown away later in VM bringup, but useful for now.
|
||||
gPageRoot[1023] = (uint32)gPageRoot | kDefaultPageFlags;
|
||||
#endif
|
||||
|
||||
// also map it on the next vpage
|
||||
gKernelArgs.arch_args.vir_pgroot = get_next_virtual_page();
|
||||
map_page(gKernelArgs.arch_args.vir_pgroot, (uint32)gPageRoot, kDefaultPageFlags);
|
||||
|
||||
// set virtual addr for interrupt vector table
|
||||
gKernelArgs.arch_args.vir_vbr = gKernelArgs.arch_args.vir_pgroot
|
||||
+ VBR_PAGE_OFFSET;
|
||||
|
||||
// map in a kernel stack
|
||||
gKernelArgs.cpu_kstack[0].start = (addr_t)mmu_allocate(NULL,
|
||||
KERNEL_STACK_SIZE + KERNEL_STACK_GUARD_PAGES * B_PAGE_SIZE);
|
||||
gKernelArgs.cpu_kstack[0].size = KERNEL_STACK_SIZE
|
||||
+ KERNEL_STACK_GUARD_PAGES * B_PAGE_SIZE;
|
||||
|
||||
TRACE(("kernel stack at 0x%lx to 0x%lx\n", gKernelArgs.cpu_kstack[0].start,
|
||||
gKernelArgs.cpu_kstack[0].start + gKernelArgs.cpu_kstack[0].size));
|
||||
|
||||
// st ram as 1st range
|
||||
gKernelArgs.physical_memory_range[0].start = ATARI_CHIPRAM_BASE;
|
||||
gKernelArgs.physical_memory_range[0].size = *TOSVARphystop - ATARI_CHIPRAM_BASE;
|
||||
gKernelArgs.num_physical_memory_ranges = 1;
|
||||
|
||||
// fast ram as 2nd range
|
||||
if (fastram_top) {
|
||||
gKernelArgs.physical_memory_range[1].start =
|
||||
ATARI_FASTRAM_BASE;
|
||||
gKernelArgs.physical_memory_range[1].size =
|
||||
fastram_top - ATARI_FASTRAM_BASE;
|
||||
gKernelArgs.num_physical_memory_ranges++;
|
||||
|
||||
}
|
||||
|
||||
// mark the video area allocated
|
||||
addr_t video_base = *TOSVAR_memtop;
|
||||
video_base &= ~(B_PAGE_SIZE-1);
|
||||
gKernelArgs.physical_allocated_range[gKernelArgs.num_physical_allocated_ranges].start = video_base;
|
||||
gKernelArgs.physical_allocated_range[gKernelArgs.num_physical_allocated_ranges].size = *TOSVARphystop - video_base;
|
||||
gKernelArgs.num_physical_allocated_ranges++;
|
||||
|
||||
|
||||
gKernelArgs.arch_args.plat_args.atari.nat_feat.nf_page =
|
||||
get_next_physical_page() /*| 0xff000000*/;
|
||||
|
||||
}
|
||||
|
||||
|
||||
// #pragma mark -
|
||||
|
||||
|
||||
extern "C" status_t
|
||||
platform_allocate_region(void **_address, size_t size, uint8 protection,
|
||||
bool /*exactAddress*/)
|
||||
{
|
||||
void *address = mmu_allocate(*_address, size);
|
||||
if (address == NULL)
|
||||
return B_NO_MEMORY;
|
||||
|
||||
*_address = address;
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
extern "C" status_t
|
||||
platform_free_region(void *address, size_t size)
|
||||
{
|
||||
mmu_free(address, size);
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
platform_release_heap(struct stage2_args *args, void *base)
|
||||
{
|
||||
// It will be freed automatically, since it is in the
|
||||
// identity mapped region, and not stored in the kernel's
|
||||
// page tables.
|
||||
}
|
||||
|
||||
|
||||
status_t
|
||||
platform_init_heap(struct stage2_args *args, void **_base, void **_top)
|
||||
{
|
||||
void *heap = (void *)get_next_physical_address(args->heap_size);
|
||||
if (heap == NULL)
|
||||
return B_NO_MEMORY;
|
||||
|
||||
*_base = heap;
|
||||
*_top = (void *)((int8 *)heap + args->heap_size);
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
@@ -0,0 +1,52 @@
|
||||
/*
|
||||
* Copyright 2004-2005, Axel Dörfler, [email protected]. All rights reserved.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*/
|
||||
#ifndef MMU_H
|
||||
#define MMU_H
|
||||
|
||||
|
||||
#include <SupportDefs.h>
|
||||
|
||||
|
||||
// For use with mmu_map_physical_memory()
|
||||
static const uint32 kDefaultPageFlags = 0x3; // present, R/W
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
extern void mmu_init(void);
|
||||
extern void mmu_init_for_kernel(void);
|
||||
extern addr_t mmu_map_physical_memory(addr_t physicalAddress, size_t size, uint32 flags);
|
||||
extern void *mmu_allocate(void *virtualAddress, size_t size);
|
||||
extern void mmu_free(void *virtualAddress, size_t size);
|
||||
|
||||
extern addr_t mmu_get_next_page_tables();
|
||||
|
||||
|
||||
struct boot_mmu_ops {
|
||||
void (*initialize)(void);
|
||||
/* len=0 to disable */
|
||||
status_t (*set_tt)(int which, addr_t pa, size_t len, uint32 perms);
|
||||
/* load root pointers */
|
||||
status_t (*load_rp)(addr_t pa);
|
||||
status_t (*allocate_kernel_pgdirs)(void);
|
||||
status_t (*enable_paging)(void);
|
||||
status_t (*add_page_table)(addr_t virtualAddress);
|
||||
void (*unmap_page)(addr_t virtualAddress);
|
||||
void (*map_page)(addr_t virtualAddress, addr_t pa, uint32 flags);
|
||||
};
|
||||
|
||||
extern const struct boot_mmu_ops k030MMUOps;
|
||||
extern const struct boot_mmu_ops k040MMUOps;
|
||||
extern const struct boot_mmu_ops k060MMUOps;
|
||||
|
||||
|
||||
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* MMU_H */
|
||||
@@ -0,0 +1,144 @@
|
||||
/*
|
||||
* Copyright 2004-2007, Axel Dörfler, [email protected].
|
||||
* Based on code written by Travis Geiselbrecht for NewOS.
|
||||
*
|
||||
* Distributed under the terms of the MIT License.
|
||||
*/
|
||||
|
||||
|
||||
#include "mmu.h"
|
||||
|
||||
#include <boot/platform.h>
|
||||
#include <boot/stdio.h>
|
||||
#include <boot/kernel_args.h>
|
||||
#include <boot/stage2.h>
|
||||
#include <arch/cpu.h>
|
||||
#include <arch_kernel.h>
|
||||
#include <kernel.h>
|
||||
|
||||
#include <OS.h>
|
||||
|
||||
#include <string.h>
|
||||
|
||||
#include "arch_030_mmu.h"
|
||||
|
||||
|
||||
#define TRACE_MMU
|
||||
#ifdef TRACE_MMU
|
||||
# define TRACE(x) dprintf x
|
||||
#else
|
||||
# define TRACE(x) ;
|
||||
#endif
|
||||
|
||||
|
||||
extern page_root_entry *gPageRoot;
|
||||
|
||||
|
||||
static void
|
||||
initialize(void)
|
||||
{
|
||||
TRACE(("mmu_030:initialize\n"));
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
set_tt(int which, addr_t pa, size_t len, uint32 perms)
|
||||
{
|
||||
TRACE(("mmu_030:set_tt(%d, 0x%lx, 0x%lx, 0x%08lx)\n", which, pa, len, perms));
|
||||
uint32 mask;
|
||||
uint32 ttr = 0;
|
||||
mask = 0x0000ffff;
|
||||
if (len) {
|
||||
len = (len >> 24) & 0x00ff;
|
||||
while (len >>= 1)
|
||||
mask <<= 1;
|
||||
// enable, cachable(?), r/w
|
||||
// super only
|
||||
// mc68030 user's manual, page 9-57
|
||||
ttr = 0x08043;
|
||||
ttr |= (pa & 0xff000000);
|
||||
ttr |= (mask & 0x00ff0000);
|
||||
}
|
||||
TRACE(("mmu_030:set_tt: 0x%08lx\n", ttr));
|
||||
|
||||
/* as seen in linux and BSD code,
|
||||
* we need to use .chip pseudo op here as -m68030 doesn't seem to help gas grok it.
|
||||
*/
|
||||
switch (which) {
|
||||
case 0:
|
||||
asm volatile( \
|
||||
".chip 68030\n\t" \
|
||||
"pmove %%tt0,(%0)\n\t" \
|
||||
".chip 68k\n\t" \
|
||||
: : "a"(&ttr));
|
||||
break;
|
||||
case 1:
|
||||
asm volatile( \
|
||||
".chip 68030\n\t" \
|
||||
"pmove (%0),%%tt1\n" \
|
||||
".chip 68k\n\t" \
|
||||
: : "a"(&ttr));
|
||||
break;
|
||||
default:
|
||||
return EINVAL;
|
||||
}
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
load_rp(addr_t pa)
|
||||
{
|
||||
TRACE(("mmu_030:load_rp(0x%lx)\n", pa));
|
||||
long_page_directory_entry entry;
|
||||
*(uint64 *)&entry = DFL_PAGEENT_VAL;
|
||||
entry.type = DT_ROOT;
|
||||
entry.addr = TA_TO_PREA(((addr_t)pa));
|
||||
|
||||
asm volatile( \
|
||||
"pmove (%0),%%srp\n" \
|
||||
"pmove (%0),%%crp\n" \
|
||||
: : "a"((uint64 *)&entry));
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
allocate_kernel_pgdirs(void)
|
||||
{
|
||||
page_root_entry *pr = gPageRoot;
|
||||
page_directory_entry *pd;
|
||||
addr_t tbl;
|
||||
int i;
|
||||
|
||||
// we'll fill in the 2nd half with ready made page dirs
|
||||
for (i = NUM_ROOTENT_PER_TBL/2; i < NUM_ROOTENT_PER_TBL; i++) {
|
||||
if (i % NUM_DIRTBL_PER_PAGE)
|
||||
tbl += SIZ_DIRTBL;
|
||||
else
|
||||
tbl = mmu_get_next_page_tables();
|
||||
pr[i].addr = TA_TO_PREA(tbl);
|
||||
pr[i].type = DT_ROOT;
|
||||
pd = (page_directory_entry *)tbl;
|
||||
for (int32 j = 0; j < NUM_DIRENT_PER_TBL; j++)
|
||||
*(page_directory_entry_scalar *)(&pd[j]) = DFL_DIRENT_VAL;
|
||||
}
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
enable_paging(void)
|
||||
{
|
||||
TRACE(("mmu_030:enable_paging\n"));
|
||||
return B_NO_INIT;
|
||||
}
|
||||
|
||||
|
||||
const struct boot_mmu_ops k030MMUOps = {
|
||||
&initialize,
|
||||
&set_tt,
|
||||
&load_rp,
|
||||
&allocate_kernel_pgdirs,
|
||||
&enable_paging
|
||||
};
|
||||
@@ -0,0 +1,327 @@
|
||||
/*
|
||||
* Copyright 2004-2007, Axel Dörfler, [email protected].
|
||||
* Based on code written by Travis Geiselbrecht for NewOS.
|
||||
*
|
||||
* Distributed under the terms of the MIT License.
|
||||
*/
|
||||
|
||||
|
||||
#include "mmu.h"
|
||||
|
||||
#include <boot/platform.h>
|
||||
#include <boot/stdio.h>
|
||||
#include <boot/kernel_args.h>
|
||||
#include <boot/stage2.h>
|
||||
#include <arch/cpu.h>
|
||||
#include <arch_kernel.h>
|
||||
#include <kernel.h>
|
||||
|
||||
#include <OS.h>
|
||||
|
||||
#include <string.h>
|
||||
|
||||
#include "arch_040_mmu.h"
|
||||
|
||||
|
||||
//#define TRACE_MMU
|
||||
#ifdef TRACE_MMU
|
||||
# define TRACE(x) dprintf x
|
||||
#else
|
||||
# define TRACE(x) ;
|
||||
#endif
|
||||
|
||||
|
||||
extern page_root_entry *gPageRoot;
|
||||
|
||||
|
||||
static void
|
||||
initialize(void)
|
||||
{
|
||||
TRACE(("mmu_040:initialize\n"));
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
set_tt(int which, addr_t pa, size_t len, uint32 perms /* NOTUSED */)
|
||||
{
|
||||
TRACE(("mmu_040:set_tt(%d, 0x%lx, 0x%lx, 0x%08lx)\n", which, pa, len, perms));
|
||||
uint32 mask;
|
||||
uint32 ttr = 0;
|
||||
mask = 0x0000ffff;
|
||||
if (len) {
|
||||
len = (len >> 24) & 0x00ff;
|
||||
while (len >>= 1)
|
||||
mask <<= 1;
|
||||
// enable, super only, upa=0,
|
||||
// cachable write-through, rw
|
||||
ttr = 0x0a000;
|
||||
ttr |= (pa & 0xff000000);
|
||||
ttr |= (mask & 0x00ff0000);
|
||||
}
|
||||
TRACE(("mmu_040:set_tt: 0x%08lx\n", ttr));
|
||||
|
||||
|
||||
switch (which) {
|
||||
case 0:
|
||||
asm volatile( \
|
||||
"movec %0,%%dtt0\n" \
|
||||
"movec %0,%%itt0\n" \
|
||||
: : "d"(ttr));
|
||||
break;
|
||||
case 1:
|
||||
asm volatile( \
|
||||
"movec %0,%%dtt1\n" \
|
||||
"movec %0,%%itt1\n" \
|
||||
: : "d"(ttr));
|
||||
break;
|
||||
default:
|
||||
return EINVAL;
|
||||
}
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
load_rp(addr_t pa)
|
||||
{
|
||||
TRACE(("mmu_040:load_rp(0x%lx)\n", pa));
|
||||
// sanity check
|
||||
if (pa & ((1 << 9) - 1)) {
|
||||
panic("mmu root pointer missaligned!");
|
||||
return EINVAL;
|
||||
}
|
||||
// make sure it's empty
|
||||
page_directory_entry_scalar *pr = (page_directory_entry_scalar *)pa;
|
||||
for (int32 j = 0; j < NUM_ROOTENT_PER_TBL; j++)
|
||||
pr[j] = DFL_ROOTENT_VAL;
|
||||
|
||||
/* mc68040 user's manual, 6-37 */
|
||||
/* pflush before... why not after ? */
|
||||
asm volatile( \
|
||||
"pflusha\n" \
|
||||
"movec %0,%%srp\n" \
|
||||
"movec %0,%%urp\n" \
|
||||
"pflusha\n" \
|
||||
: : "d"(pa));
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
allocate_kernel_pgdirs(void)
|
||||
{
|
||||
page_root_entry *pr = gPageRoot;
|
||||
page_directory_entry *pd;
|
||||
addr_t tbl;
|
||||
int i;
|
||||
|
||||
// we'll fill in the 2nd half with ready made page dirs
|
||||
for (i = NUM_ROOTENT_PER_TBL/2; i < NUM_ROOTENT_PER_TBL; i++) {
|
||||
if (i % NUM_DIRTBL_PER_PAGE)
|
||||
tbl += SIZ_DIRTBL;
|
||||
else
|
||||
tbl = mmu_get_next_page_tables();
|
||||
pr[i].addr = TA_TO_PREA(tbl);
|
||||
pr[i].type = DT_ROOT;
|
||||
pd = (page_directory_entry *)tbl;
|
||||
for (int32 j = 0; j < NUM_DIRENT_PER_TBL; j++)
|
||||
*(page_directory_entry_scalar *)(&pd[j]) = DFL_DIRENT_VAL;
|
||||
}
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
enable_paging(void)
|
||||
{
|
||||
TRACE(("mmu_040:enable_paging\n"));
|
||||
uint16 tcr = 0x8000; // Enable, 4K page size
|
||||
asm volatile( \
|
||||
"pflusha\n" \
|
||||
"movec %0,%%tcr\n" \
|
||||
"pflusha\n" \
|
||||
: : "d"(tcr));
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
add_page_table(addr_t virtualAddress)
|
||||
{
|
||||
page_root_entry *pr = gPageRoot;
|
||||
page_directory_entry *pd;
|
||||
page_table_entry *pt;
|
||||
addr_t tbl;
|
||||
uint32 index;
|
||||
uint32 i;
|
||||
|
||||
TRACE(("mmu->add_page_table(base = %p)\n", (void *)virtualAddress));
|
||||
|
||||
// everything much simpler here because pa = va
|
||||
// thanks to transparent translation
|
||||
|
||||
index = VADDR_TO_PRENT(virtualAddress);
|
||||
if (pr[index].type != DT_ROOT)
|
||||
panic("invalid page root entry %d\n", index);
|
||||
#if 0
|
||||
// not needed anymore
|
||||
if (pr[index].type != DT_ROOT) {
|
||||
unsigned aindex = index & ~(NUM_DIRTBL_PER_PAGE-1); /* aligned */
|
||||
//TRACE(("missing page root entry %d ai %d\n", index, aindex));
|
||||
tbl = mmu_get_next_page_tables();
|
||||
if (!tbl)
|
||||
return ENOMEM;
|
||||
// for each pgdir on the allocated page:
|
||||
for (i = 0; i < NUM_DIRTBL_PER_PAGE; i++) {
|
||||
page_root_entry *apr = &pr[aindex + i];
|
||||
apr->addr = TA_TO_PREA(tbl);
|
||||
apr->type = DT_ROOT;
|
||||
//TRACE(("inserting tbl @ %p as %08x pr[%d] %08x\n", tbl, TA_TO_PREA(tbl), aindex + i, *(uint32 *)apr));
|
||||
// clear the table
|
||||
//TRACE(("clearing table[%d]\n", i));
|
||||
pd = (page_directory_entry *)tbl;
|
||||
for (int32 j = 0; j < NUM_DIRENT_PER_TBL; j++)
|
||||
*(page_directory_entry_scalar *)(&pd[j]) = DFL_DIRENT_VAL;
|
||||
tbl += SIZ_DIRTBL;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
pd = (page_directory_entry *)PRE_TO_TA(pr[index]);
|
||||
|
||||
index = VADDR_TO_PDENT(virtualAddress);
|
||||
if (pd[index].type != DT_DIR) {
|
||||
unsigned aindex = index & ~(NUM_PAGETBL_PER_PAGE-1); /* aligned */
|
||||
//TRACE(("missing page dir entry %d ai %d\n", index, aindex));
|
||||
tbl = mmu_get_next_page_tables();
|
||||
if (!tbl)
|
||||
return ENOMEM;
|
||||
// for each pgdir on the allocated page:
|
||||
for (i = 0; i < NUM_PAGETBL_PER_PAGE; i++) {
|
||||
page_directory_entry *apd = &pd[aindex + i];
|
||||
apd->addr = TA_TO_PDEA(tbl);
|
||||
apd->type = DT_DIR;
|
||||
// clear the table
|
||||
//TRACE(("clearing table[%d]\n", i));
|
||||
pt = (page_table_entry *)tbl;
|
||||
for (int32 j = 0; j < NUM_PAGEENT_PER_TBL; j++)
|
||||
*(page_table_entry_scalar *)(&pt[j]) = DFL_PAGEENT_VAL;
|
||||
tbl += SIZ_PAGETBL;
|
||||
}
|
||||
}
|
||||
#if 0
|
||||
pt = PDE_TO_TA(pd[index]);
|
||||
|
||||
index = VADDR_TO_PTENT(virtualAddress);
|
||||
pt[index].addr = TA_TO_PTEA(0xdeadb00b);
|
||||
pt[index].supervisor = 1;
|
||||
pt[index].type = DT_PAGE;
|
||||
#endif
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
static page_table_entry *
|
||||
lookup_pte(addr_t virtualAddress)
|
||||
{
|
||||
page_root_entry *pr = gPageRoot;
|
||||
page_directory_entry *pd;
|
||||
page_table_entry *pt;
|
||||
uint32 rindex, dindex, pindex;
|
||||
|
||||
rindex = VADDR_TO_PRENT(virtualAddress);
|
||||
if (pr[rindex].type != DT_ROOT)
|
||||
panic("lookup_pte: invalid entry pgrt[%d]", rindex);
|
||||
pd = (page_directory_entry *)PRE_TO_TA(pr[rindex]);
|
||||
|
||||
dindex = VADDR_TO_PDENT(virtualAddress);
|
||||
if (pd[dindex].type != DT_DIR)
|
||||
panic("lookup_pte: invalid entry pgrt[%d] prdir[%d]", rindex, dindex);
|
||||
pt = (page_table_entry *)PDE_TO_TA(pd[dindex]);
|
||||
|
||||
pindex = VADDR_TO_PTENT(virtualAddress);
|
||||
#if 0 // of course, it's used in map_page!
|
||||
if (pt[pindex].type != DT_PAGE)
|
||||
panic("lookup_pte: invalid entry pgrt[%d] prdir[%d] pgtbl[%d]",
|
||||
rindex, dindex, pindex);
|
||||
#endif
|
||||
|
||||
return (&pt[pindex]);
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
unmap_page(addr_t virtualAddress)
|
||||
{
|
||||
page_table_entry *pt;
|
||||
|
||||
TRACE(("mmu->unmap_page(virtualAddress = %p)\n", (void *)virtualAddress));
|
||||
|
||||
if (virtualAddress < KERNEL_BASE)
|
||||
panic("unmap_page: asked to unmap invalid page %p!\n",
|
||||
(void *)virtualAddress);
|
||||
|
||||
// unmap the page from the correct page table
|
||||
pt = lookup_pte(virtualAddress);
|
||||
|
||||
if (pt->type != DT_PAGE)
|
||||
panic("unmap_page: asked to map non-existing page for %08x\n",
|
||||
virtualAddress);
|
||||
|
||||
pt->addr = TA_TO_PTEA(0xdeadb00b);
|
||||
pt->type = DT_INVALID;
|
||||
|
||||
// flush ATC
|
||||
asm volatile("pflush (%0)" : : "a" (virtualAddress));
|
||||
}
|
||||
|
||||
|
||||
/** insert the physical address into existing page table */
|
||||
static void
|
||||
map_page(addr_t virtualAddress, addr_t physicalAddress, uint32 flags)
|
||||
{
|
||||
page_table_entry *pt;
|
||||
|
||||
TRACE(("mmu->map_page: vaddr 0x%lx, paddr 0x%lx\n", virtualAddress, physicalAddress));
|
||||
|
||||
|
||||
physicalAddress &= ~(B_PAGE_SIZE - 1);
|
||||
|
||||
// map the page to the correct page table
|
||||
|
||||
pt = lookup_pte(virtualAddress);
|
||||
|
||||
if (pt->type != DT_INVALID)
|
||||
panic("map_page: asked to map existing page for %08x\n",
|
||||
virtualAddress);
|
||||
|
||||
TRACE(("map_page: inserting pageTableEntry %p, physicalAddress %p\n",
|
||||
pt, physicalAddress));
|
||||
|
||||
|
||||
pt->addr = TA_TO_PTEA(physicalAddress);
|
||||
pt->supervisor = 1;
|
||||
#ifdef MMU_HAS_GLOBAL_PAGES
|
||||
pt->global = 1;
|
||||
#endif
|
||||
pt->type = DT_PAGE;
|
||||
// XXX: are flags needed ? ro ? global ?
|
||||
|
||||
// flush ATC
|
||||
asm volatile("pflush (%0)" : : "a" (virtualAddress));
|
||||
|
||||
TRACE(("mmu->map_page: done\n"));
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
const struct boot_mmu_ops k040MMUOps = {
|
||||
&initialize,
|
||||
&set_tt,
|
||||
&load_rp,
|
||||
&allocate_kernel_pgdirs,
|
||||
&enable_paging,
|
||||
&add_page_table,
|
||||
&unmap_page,
|
||||
&map_page
|
||||
};
|
||||
Reference in New Issue
Block a user