arch/x86/kernel/platform-quirks.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/platform-quirks.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/platform-quirks.c
Extension
.c
Size
1154 bytes
Lines
48
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pnp.h>

#include <asm/setup.h>
#include <asm/bios_ebda.h>

void __init x86_early_init_platform_quirks(void)
{
	x86_platform.legacy.i8042 = X86_LEGACY_I8042_EXPECTED_PRESENT;
	x86_platform.legacy.rtc = 1;
	x86_platform.legacy.warm_reset = 1;
	x86_platform.legacy.reserve_bios_regions = 0;
	x86_platform.legacy.devices.pnpbios = 1;

	switch (boot_params.hdr.hardware_subarch) {
	case X86_SUBARCH_PC:
		x86_platform.legacy.reserve_bios_regions = 1;
		break;
	case X86_SUBARCH_XEN:
		x86_platform.legacy.devices.pnpbios = 0;
		x86_platform.legacy.rtc = 0;
		break;
	case X86_SUBARCH_INTEL_MID:
	case X86_SUBARCH_CE4100:
		x86_platform.legacy.devices.pnpbios = 0;
		x86_platform.legacy.rtc = 0;
		x86_platform.legacy.i8042 = X86_LEGACY_I8042_PLATFORM_ABSENT;
		break;
	}

	if (x86_platform.set_legacy_features)
		x86_platform.set_legacy_features();
}

bool __init x86_pnpbios_disabled(void)
{
	return x86_platform.legacy.devices.pnpbios == 0;
}

#if defined(CONFIG_PNPBIOS)
bool __init arch_pnpbios_disabled(void)
{
	return x86_pnpbios_disabled();
}
#endif

Annotation

Implementation Notes