| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-i386/mach-default/apm.h |
| 3 | * |
| 4 | * Machine specific APM BIOS functions for generic. |
| 5 | * Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp> |
| 6 | */ |
| 7 | |
| 8 | #ifndef _ASM_APM_H |
| 9 | #define _ASM_APM_H |
| 10 | |
| 11 | #ifdef APM_ZERO_SEGS |
| 12 | # define APM_DO_ZERO_SEGS \ |
| 13 | "pushl %%ds\n\t" \ |
| 14 | "pushl %%es\n\t" \ |
| 15 | "xorl %%edx, %%edx\n\t" \ |
| 16 | "mov %%dx, %%ds\n\t" \ |
| 17 | "mov %%dx, %%es\n\t" \ |
| 18 | "mov %%dx, %%fs\n\t" \ |
| 19 | "mov %%dx, %%gs\n\t" |
| 20 | # define APM_DO_POP_SEGS \ |
| 21 | "popl %%es\n\t" \ |
| 22 | "popl %%ds\n\t" |
| 23 | #else |
| 24 | # define APM_DO_ZERO_SEGS |
| 25 | # define APM_DO_POP_SEGS |
| 26 | #endif |
| 27 | |
| 28 | static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in, |
| 29 | u32 *eax, u32 *ebx, u32 *ecx, |
| 30 | u32 *edx, u32 *esi) |
| 31 | { |
| 32 | /* |
| 33 | * N.B. We do NOT need a cld after the BIOS call |
| 34 | * because we always save and restore the flags. |
| 35 | */ |
| 36 | __asm__ __volatile__(APM_DO_ZERO_SEGS |
| 37 | "pushl %%edi\n\t" |
| 38 | "pushl %%ebp\n\t" |
| 39 | "lcall *%%cs:apm_bios_entry\n\t" |
| 40 | "setc %%al\n\t" |
| 41 | "popl %%ebp\n\t" |
| 42 | "popl %%edi\n\t" |
| 43 | APM_DO_POP_SEGS |
| 44 | : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx), |
| 45 | "=S" (*esi) |
| 46 | : "a" (func), "b" (ebx_in), "c" (ecx_in) |
| 47 | : "memory", "cc"); |
| 48 | } |
| 49 | |
| 50 | static inline u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in, |
| 51 | u32 ecx_in, u32 *eax) |
| 52 | { |
| 53 | int cx, dx, si; |
| 54 | u8 error; |
| 55 | |
| 56 | /* |
| 57 | * N.B. We do NOT need a cld after the BIOS call |
| 58 | * because we always save and restore the flags. |
| 59 | */ |
| 60 | __asm__ __volatile__(APM_DO_ZERO_SEGS |
| 61 | "pushl %%edi\n\t" |
| 62 | "pushl %%ebp\n\t" |
| 63 | "lcall *%%cs:apm_bios_entry\n\t" |
| 64 | "setc %%bl\n\t" |
| 65 | "popl %%ebp\n\t" |
| 66 | "popl %%edi\n\t" |
| 67 | APM_DO_POP_SEGS |
| 68 | : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx), |
| 69 | "=S" (si) |
| 70 | : "a" (func), "b" (ebx_in), "c" (ecx_in) |
| 71 | : "memory", "cc"); |
| 72 | return error; |
| 73 | } |
| 74 | |
| 75 | #endif /* _ASM_APM_H */ |