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boot/efi: implement ranges property for simple-bus

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see Devicetree Specification, section 2.3.8

Change-Id: I788bbaa67c8e8f9b57f138418eb1c3131bbe2010
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5188
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>
This commit is contained in:
David Karoly
2022-04-09 14:51:47 +00:00
committed by Fredrik Holmqvist
parent ab3c8bea07
commit 2b5b228442
1 changed files with 45 additions and 0 deletions
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src/system/boot/platform/efi/dtb.cpp
+45
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@@ -364,6 +364,51 @@ dtb_get_reg(const void* fdt, int node, size_t idx, addr_range& range)
case 2: range.size = fdt64_to_cpu(*(uint64*)prop); prop += 8; break;
default: panic("unsupported sizeCells");
}
int parent = fdt_parent_offset(fdt, node);
if (parent >= 0) {
uint32 parentAddressCells = dtb_get_address_cells(fdt, parent);
uint32 rangesSize = 0;
uint32 *ranges = (uint32 *)fdt_getprop(fdt, parent, "ranges", (int *)&rangesSize);
if (ranges == NULL)
return true;
uint32 rangesPos = 0;
while (rangesSize >= (rangesPos + parentAddressCells + addressCells + sizeCells)) {
addr_t childAddress;
addr_t parentAddress;
size_t rangeSize;
if (addressCells == 1) {
childAddress = fdt32_to_cpu(*(uint32*)(ranges+rangesPos));
} else {
childAddress = fdt64_to_cpu(*(uint64*)(ranges+rangesPos));
}
rangesPos += addressCells;
if (parentAddressCells == 1) {
parentAddress = fdt32_to_cpu(*(uint32*)(ranges+rangesPos));
} else {
parentAddress = fdt64_to_cpu(*(uint64*)(ranges+rangesPos));
}
rangesPos += parentAddressCells;
if (sizeCells == 1) {
rangeSize = fdt32_to_cpu(*(uint32*)(ranges+rangesPos));
} else {
rangeSize = fdt64_to_cpu(*(uint64*)(ranges+rangesPos));
}
rangesPos += sizeCells;
if ((range.start >= childAddress) && (range.start <= childAddress + rangeSize)) {
range.start -= childAddress;
range.start += parentAddress;
break;
}
}
}
return true;
}