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author | Kevin O'Connor <kevin@koconnor.net> | 2013-09-14 13:01:30 -0400 |
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committer | Kevin O'Connor <kevin@koconnor.net> | 2013-09-18 20:48:34 -0400 |
commit | b9c6a960808451d75acd9c048f418dd2c92ac59d (patch) | |
tree | 7b7cd650fae1418f6284fc7579762cf832c17fdf /src/x86.h | |
parent | 490797e851af64481a998b80072554b75009483c (diff) | |
download | seabios-hppa-b9c6a960808451d75acd9c048f418dd2c92ac59d.zip seabios-hppa-b9c6a960808451d75acd9c048f418dd2c92ac59d.tar.gz seabios-hppa-b9c6a960808451d75acd9c048f418dd2c92ac59d.tar.bz2 |
Split x86 specific functions out of util.c/h to new files x86.c/h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/x86.h')
-rw-r--r-- | src/x86.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/x86.h b/src/x86.h new file mode 100644 index 0000000..389d747 --- /dev/null +++ b/src/x86.h @@ -0,0 +1,168 @@ +// Basic x86 asm functions. +#ifndef __X86_H +#define __X86_H + +// CPU flag bitdefs +#define F_CF (1<<0) +#define F_ZF (1<<6) +#define F_IF (1<<9) +#define F_ID (1<<21) + +// CR0 flags +#define CR0_PG (1<<31) // Paging +#define CR0_CD (1<<30) // Cache disable +#define CR0_NW (1<<29) // Not Write-through +#define CR0_PE (1<<0) // Protection enable + +#ifndef __ASSEMBLY__ + +#include "types.h" // u32 + +static inline void irq_disable(void) +{ + asm volatile("cli": : :"memory"); +} + +static inline void irq_enable(void) +{ + asm volatile("sti": : :"memory"); +} + +static inline u32 save_flags(void) +{ + u32 flags; + asm volatile("pushfl ; popl %0" : "=rm" (flags)); + return flags; +} + +static inline void restore_flags(u32 flags) +{ + asm volatile("pushl %0 ; popfl" : : "g" (flags) : "memory", "cc"); +} + +static inline void cpu_relax(void) +{ + asm volatile("rep ; nop": : :"memory"); +} + +static inline void nop(void) +{ + asm volatile("nop"); +} + +static inline void hlt(void) +{ + asm volatile("hlt": : :"memory"); +} + +static inline void wbinvd(void) +{ + asm volatile("wbinvd": : :"memory"); +} + +#define CPUID_TSC (1 << 4) +#define CPUID_MSR (1 << 5) +#define CPUID_APIC (1 << 9) +#define CPUID_MTRR (1 << 12) +static inline void __cpuid(u32 index, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) +{ + asm("cpuid" + : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) + : "0" (index)); +} + +static inline u32 getcr0(void) { + u32 cr0; + asm("movl %%cr0, %0" : "=r"(cr0)); + return cr0; +} +static inline void setcr0(u32 cr0) { + asm("movl %0, %%cr0" : : "r"(cr0)); +} + +static inline u64 rdmsr(u32 index) +{ + u64 ret; + asm ("rdmsr" : "=A"(ret) : "c"(index)); + return ret; +} + +static inline void wrmsr(u32 index, u64 val) +{ + asm volatile ("wrmsr" : : "c"(index), "A"(val)); +} + +static inline u64 rdtscll(void) +{ + u64 val; + asm volatile("rdtsc" : "=A" (val)); + return val; +} + +static inline u32 __ffs(u32 word) +{ + asm("bsf %1,%0" + : "=r" (word) + : "rm" (word)); + return word; +} +static inline u32 __fls(u32 word) +{ + asm("bsr %1,%0" + : "=r" (word) + : "rm" (word)); + return word; +} + +static inline u32 getesp(void) { + u32 esp; + asm("movl %%esp, %0" : "=rm"(esp)); + return esp; +} + +static inline void writel(void *addr, u32 val) { + *(volatile u32 *)addr = val; +} +static inline void writew(void *addr, u16 val) { + *(volatile u16 *)addr = val; +} +static inline void writeb(void *addr, u8 val) { + *(volatile u8 *)addr = val; +} +static inline u32 readl(const void *addr) { + return *(volatile const u32 *)addr; +} +static inline u16 readw(const void *addr) { + return *(volatile const u16 *)addr; +} +static inline u8 readb(const void *addr) { + return *(volatile const u8 *)addr; +} + +// GDT bits +#define GDT_CODE (0x9bULL << 40) // Code segment - P,R,A bits also set +#define GDT_DATA (0x93ULL << 40) // Data segment - W,A bits also set +#define GDT_B (0x1ULL << 54) // Big flag +#define GDT_G (0x1ULL << 55) // Granularity flag +// GDT bits for segment base +#define GDT_BASE(v) ((((u64)(v) & 0xff000000) << 32) \ + | (((u64)(v) & 0x00ffffff) << 16)) +// GDT bits for segment limit (0-1Meg) +#define GDT_LIMIT(v) ((((u64)(v) & 0x000f0000) << 32) \ + | (((u64)(v) & 0x0000ffff) << 0)) +// GDT bits for segment limit (0-4Gig in 4K chunks) +#define GDT_GRANLIMIT(v) (GDT_G | GDT_LIMIT((v) >> 12)) + +struct descloc_s { + u16 length; + u32 addr; +} PACKED; + + +// x86.c +void cpuid(u32 index, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx); + + +#endif // !__ASSEMBLY__ + +#endif // x86.h |