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My Jmicron SATA card depends on the BIOS not clearing AL when setting AH. 

Signed-off-by: Myles Watson <mylesgw@gmail.com>
Acked-by: Myles Watson <mylesgw@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Myles Watson 2010-09-07 23:27:59 +00:00
parent 6c9bc01b0e
commit fe09fd1dac
1 changed files with 10 additions and 4 deletions
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14
src/devices/oprom/x86_interrupts.c
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@ -99,7 +99,8 @@ int int1a_handler(struct eregs *regs)
}
if (dev) {
unsigned short busdevfn;
regs->eax = 0;
regs->eax &= 0xffff00ff; /* Clear AH */
regs->eax |= PCIBIOS_SUCCESSFUL;
// busnum is an unsigned char;
// devfn is an int, so we mask it off.
busdevfn = (dev->bus->secondary << 8)
@ -108,7 +109,8 @@ int int1a_handler(struct eregs *regs)
regs->ebx = busdevfn;
retval = 0;
} else {
regs->eax = PCIBIOS_NODEV;
regs->eax &= 0xffff00ff; /* Clear AH */
regs->eax |= PCIBIOS_NODEV;
retval = -1;
}
break;
@ -125,7 +127,8 @@ int int1a_handler(struct eregs *regs)
if (!dev) {
printk(BIOS_DEBUG, "0x%x: BAD DEVICE bus %d devfn 0x%x\n", func, bus, devfn);
// Or are we supposed to return PCIBIOS_NODEV?
regs->eax = PCIBIOS_BADREG;
regs->eax &= 0xffff00ff; /* Clear AH */
regs->eax |= PCIBIOS_BADREG;
retval = -1;
return retval;
}
@ -160,11 +163,14 @@ int int1a_handler(struct eregs *regs)
printk(BIOS_DEBUG, "0x%x: bus %d devfn 0x%x reg 0x%x val 0x%x\n",
func, bus, devfn, reg, regs->ecx);
#endif
regs->eax = 0;
regs->eax &= 0xffff00ff; /* Clear AH */
regs->eax |= PCIBIOS_SUCCESSFUL;
retval = 0;
break;
default:
printk(BIOS_ERR, "UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
regs->eax &= 0xffff00ff; /* Clear AH */
regs->eax |= PCIBIOS_UNSUPPORTED;
retval = -1;
break;
}