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b58386a9bd
- Memblock setup and other early boot code cleanups (Mike Rapoport) - Export e820_table_kexec[] to sysfs (Dave Young) - Baby steps of adding relocate_kernel() debugging support (David Woodhouse) - Replace open-coded parity calculation with parity8() (Kuan-Wei Chiu) - Move the LA57 trampoline to separate source file (Ard Biesheuvel) - Misc micro-optimizations (Uros Bizjak) - Drop obsolete E820_TYPE_RESERVED_KERN and related code (Mike Rapoport) Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAmfeoawRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1gCRBAAm5MwAxTOtqRQtwUBkbGB8HEfjCHJTLIe FiLLric6lHEn2uVw/9uhlN646pWxa+487QtxRAHlR2hpm0JyEiZkawhFpnWWx8s6 WXdLVPK+CNQNKgcWC2AsIj7C71JcKBNJI2Lj8/p9Cn3AgB0s7m4e3GfuugMk43Lq aw8JHd1zzqyT9NsdfNkglwn12iui9Y0t7q0EuZgQhRXLvThwZZblJg+dvub30LGg FE2QM4dQC4K0IUhE42ea5wWylX3tmiDYpdEH/CwxPobfra4kMxnoUrrh9Dk82cma QR3wwOc4JZ6mXUWVumbtk+cyUvZ1wTGFgiSUGmomkoKz9dJewqNV4b6iRa5URGzG izZaAZyJDQk9r2dCnwLbjzQjr2SHXLvvTpmS8AlAyOEPTnc+388Fg4h4oL9N/rcM ZIxxKpfuSjiWT8tRGKGPePhqAIg7kllk/w3zSkyAsx9/DG/UrLhpLSzq0+4GPQ0E d0V6WwX41iouoAH+kmDDj3KkaezQ/ZfXcxKk2d3wSCvIEMfJkSSXFBDlanE+skrM x/0QCWVyN5zajYEEoWv8WoXov7Q67Ar6HdxtPRLtQcd/ZhpTFeq4wuitV+4phb3m twWQo43wkMI5jFf9U2b+PD//8PWfcBJhzP0BEN8rNJaq8KVa93eHsOpMqZK+5wC6 q03Wx00ewfE= =cUeH -----END PGP SIGNATURE----- Merge tag 'x86-boot-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 boot code updates from Ingo Molnar: - Memblock setup and other early boot code cleanups (Mike Rapoport) - Export e820_table_kexec[] to sysfs (Dave Young) - Baby steps of adding relocate_kernel() debugging support (David Woodhouse) - Replace open-coded parity calculation with parity8() (Kuan-Wei Chiu) - Move the LA57 trampoline to separate source file (Ard Biesheuvel) - Misc micro-optimizations (Uros Bizjak) - Drop obsolete E820_TYPE_RESERVED_KERN and related code (Mike Rapoport) * tag 'x86-boot-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/kexec: Add relocate_kernel() debugging support: Load a GDT x86/boot: Move the LA57 trampoline to separate source file x86/boot: Do not test if AC and ID eflags are changeable on x86_64 x86/bootflag: Replace open-coded parity calculation with parity8() x86/bootflag: Micro-optimize sbf_write() x86/boot: Add missing has_cpuflag() prototype x86/kexec: Export e820_table_kexec[] to sysfs x86/boot: Change some static bootflag functions to bool x86/e820: Drop obsolete E820_TYPE_RESERVED_KERN and related code x86/boot: Split parsing of boot_params into the parse_boot_params() helper function x86/boot: Split kernel resources setup into the setup_kernel_resources() helper function x86/boot: Move setting of memblock parameters to e820__memblock_setup()
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include "bitops.h"
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#include <asm/processor-flags.h>
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#include <asm/msr-index.h>
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#include "cpuflags.h"
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struct cpu_features cpu;
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u32 cpu_vendor[3];
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static bool loaded_flags;
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static int has_fpu(void)
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{
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u16 fcw = -1, fsw = -1;
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unsigned long cr0;
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asm volatile("mov %%cr0,%0" : "=r" (cr0));
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if (cr0 & (X86_CR0_EM|X86_CR0_TS)) {
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cr0 &= ~(X86_CR0_EM|X86_CR0_TS);
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asm volatile("mov %0,%%cr0" : : "r" (cr0));
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}
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asm volatile("fninit ; fnstsw %0 ; fnstcw %1"
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: "+m" (fsw), "+m" (fcw));
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return fsw == 0 && (fcw & 0x103f) == 0x003f;
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}
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#ifdef CONFIG_X86_32
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/*
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* For building the 16-bit code we want to explicitly specify 32-bit
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* push/pop operations, rather than just saying 'pushf' or 'popf' and
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* letting the compiler choose.
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*/
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bool has_eflag(unsigned long mask)
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{
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unsigned long f0, f1;
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asm volatile("pushfl \n\t"
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"pushfl \n\t"
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"pop %0 \n\t"
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"mov %0,%1 \n\t"
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"xor %2,%1 \n\t"
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"push %1 \n\t"
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"popfl \n\t"
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"pushfl \n\t"
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"pop %1 \n\t"
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"popfl"
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: "=&r" (f0), "=&r" (f1)
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: "ri" (mask));
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return !!((f0^f1) & mask);
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}
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#endif
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void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d)
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{
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asm volatile("cpuid"
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: "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d)
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: "0" (id), "2" (count)
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);
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}
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#define cpuid(id, a, b, c, d) cpuid_count(id, 0, a, b, c, d)
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void get_cpuflags(void)
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{
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u32 max_intel_level, max_amd_level;
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u32 tfms;
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u32 ignored;
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if (loaded_flags)
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return;
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loaded_flags = true;
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if (has_fpu())
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set_bit(X86_FEATURE_FPU, cpu.flags);
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if (has_eflag(X86_EFLAGS_ID)) {
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cpuid(0x0, &max_intel_level, &cpu_vendor[0], &cpu_vendor[2],
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&cpu_vendor[1]);
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if (max_intel_level >= 0x00000001 &&
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max_intel_level <= 0x0000ffff) {
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cpuid(0x1, &tfms, &ignored, &cpu.flags[4],
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&cpu.flags[0]);
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cpu.level = (tfms >> 8) & 15;
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cpu.family = cpu.level;
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cpu.model = (tfms >> 4) & 15;
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if (cpu.level >= 6)
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cpu.model += ((tfms >> 16) & 0xf) << 4;
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}
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if (max_intel_level >= 0x00000007) {
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cpuid_count(0x00000007, 0, &ignored, &ignored,
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&cpu.flags[16], &ignored);
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}
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cpuid(0x80000000, &max_amd_level, &ignored, &ignored,
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&ignored);
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if (max_amd_level >= 0x80000001 &&
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max_amd_level <= 0x8000ffff) {
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cpuid(0x80000001, &ignored, &ignored, &cpu.flags[6],
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&cpu.flags[1]);
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}
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}
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}
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