x86: Make "Disable BIOS calls" boot option actually work.

It was a complete no-op before. Now, when enabled, BIOS calls
won't be done past the bootloader, and the Framebuffer driver
will be used instead of VESA.
(cherry picked from commit 7f12208162a5fc676f7a03e050f7671919f4fb12)

Change-Id: Id7670cc060ab5273411222e27467a6dfdbbb9e7f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/11313
Reviewed-by: waddlesplash <[email protected]>

headers/private/system/safemode_defs.h

@@ -14,6 +14,7 @@
 #define B_SAFEMODE_DISABLE_ACPI				"disable_acpi"
 #define B_SAFEMODE_DISABLE_APIC				"disable_apic"
 #define B_SAFEMODE_DISABLE_APM				"disable_apm"
+#define B_SAFEMODE_DISABLE_BIOS_CALLS		"disable_bios_calls"
 #define B_SAFEMODE_DISABLE_HYPER_THREADING	"disable_hyperthreading"
 #define B_SAFEMODE_DISABLE_IDE_DMA			"disable_ide_dma"
 #define B_SAFEMODE_DISABLE_IOAPIC			"disable_ioapic"

src/add-ons/kernel/generic/bios/bios.cpp

@@ -7,6 +7,7 @@
 #include <drivers/bios.h>
 
 #include <KernelExport.h>
+#include <safemode.h>
 
 #include <AutoDeleter.h>
 
@@ -339,6 +340,11 @@ std_ops(int32 op, ...)
 {
 	switch (op) {
 		case B_MODULE_INIT:
+			if (get_safemode_boolean(B_SAFEMODE_DISABLE_BIOS_CALLS, false)) {
+				dprintf("BIOS calls disabled\n");
+				return ENOSYS;
+			}
+
 			sBIOSLock = create_sem(1, "bios lock");
 			if (sBIOSLock < B_OK)
 				return sBIOSLock;

src/system/boot/platform/bios_ia32/menu.cpp

@@ -67,9 +67,10 @@ platform_add_menus(Menu* menu)
 			item = new(std::nothrow) MenuItem("Don't call the BIOS");
 			if (item != NULL) {
 				menu->AddItem(item);
+				item->SetType(MENU_ITEM_MARKABLE);
+				item->SetData(B_SAFEMODE_DISABLE_BIOS_CALLS);
 				item->SetHelpText("Stops the system from calling BIOS "
 					"functions.");
-				item->SetType(MENU_ITEM_MARKABLE);
 			}
 
 			item = new(std::nothrow) MenuItem("Disable APM");

src/system/kernel/debug/frame_buffer_console.cpp

@@ -22,8 +22,8 @@
 
 #ifndef _BOOT_MODE
 #include <vesa_info.h>
-
 #include <edid.h>
+#include <safemode.h>
 #else
 #define mutex_lock(...)
 #define mutex_unlock(...)
@@ -510,6 +510,12 @@ frame_buffer_console_init_post_vm(kernel_args* args)
 	add_boot_item(FRAME_BUFFER_BOOT_INFO, &sBootInfo,
 		sizeof(frame_buffer_boot_info));
 
+	if (get_safemode_boolean(B_SAFEMODE_DISABLE_BIOS_CALLS, false)) {
+		// If BIOS calls are disabled, then the VESA driver can't work.
+		// So, don't report any VESA information in this case.
+		return B_OK;
+	}
+
 	sVesaModes = (vesa_mode*)malloc(args->vesa_modes_size);
 	if (sVesaModes != NULL && args->vesa_modes_size > 0) {
 		memcpy(sVesaModes, args->vesa_modes, args->vesa_modes_size);