diff options
Diffstat (limited to 'arch/x86/pci/pcbios.c')
| -rw-r--r-- | arch/x86/pci/pcbios.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/pci/pcbios.c b/arch/x86/pci/pcbios.c index 10ac8c316c46..2f7109ac4c15 100644 --- a/arch/x86/pci/pcbios.c +++ b/arch/x86/pci/pcbios.c | |||
| @@ -198,6 +198,11 @@ static int pci_bios_read(unsigned int seg, unsigned int bus, | |||
| 198 | "b" (bx), | 198 | "b" (bx), |
| 199 | "D" ((long)reg), | 199 | "D" ((long)reg), |
| 200 | "S" (&pci_indirect)); | 200 | "S" (&pci_indirect)); |
| 201 | /* | ||
| 202 | * Zero-extend the result beyond 8 bits, do not trust the | ||
| 203 | * BIOS having done it: | ||
| 204 | */ | ||
| 205 | *value &= 0xff; | ||
| 201 | break; | 206 | break; |
| 202 | case 2: | 207 | case 2: |
| 203 | __asm__("lcall *(%%esi); cld\n\t" | 208 | __asm__("lcall *(%%esi); cld\n\t" |
| @@ -210,6 +215,11 @@ static int pci_bios_read(unsigned int seg, unsigned int bus, | |||
| 210 | "b" (bx), | 215 | "b" (bx), |
| 211 | "D" ((long)reg), | 216 | "D" ((long)reg), |
| 212 | "S" (&pci_indirect)); | 217 | "S" (&pci_indirect)); |
| 218 | /* | ||
| 219 | * Zero-extend the result beyond 16 bits, do not trust the | ||
| 220 | * BIOS having done it: | ||
| 221 | */ | ||
| 222 | *value &= 0xffff; | ||
| 213 | break; | 223 | break; |
| 214 | case 4: | 224 | case 4: |
| 215 | __asm__("lcall *(%%esi); cld\n\t" | 225 | __asm__("lcall *(%%esi); cld\n\t" |