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| author | Keir Fraser <keir.fraser@citrix.com> | 2009-01-26 11:22:03 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2009-01-26 11:22:03 +0000 |
| commit | e64d0c2e625f40c177745e4ff621a2c6818607ba (patch) | |
| tree | 432065ea32fd33a7e600c219161441c3bb697daa /tools/firmware/rombios | |
| parent | c32523e1417af26881353ca1888e222c9df813ae (diff) | |
| download | xen-e64d0c2e625f40c177745e4ff621a2c6818607ba.tar.gz xen-e64d0c2e625f40c177745e4ff621a2c6818607ba.tar.bz2 xen-e64d0c2e625f40c177745e4ff621a2c6818607ba.zip | |
rombios: fix pointer argument to PMM
The pointer to PMM function arguments must be flattened for protected
mode with zero-based segments.
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
Diffstat (limited to 'tools/firmware/rombios')
| -rw-r--r-- | tools/firmware/rombios/rombios.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c index 9350eca9b0..66cf30a782 100644 --- a/tools/firmware/rombios/rombios.c +++ b/tools/firmware/rombios/rombios.c @@ -10366,19 +10366,35 @@ pmm_structure: db 0,0,0,0,0 ;; reserved pmm_entry_point: + pushf pushad - mov eax, esp - add eax, #(8*4+2+2) ;; skip regs of pushad, ip, cs - push eax ;; pointer to PMM function args +; Calculate protected-mode address of PMM function args + xor eax, eax + mov ax, sp + xor ebx, ebx + mov bx, ss + shl ebx, 4 + lea ebx, [eax+ebx+38] ;; ebx=(ss<<4)+sp+4(far call)+2(pushf)+32(pushad) + push ebx +; +; Stack layout at this point: +; +; : +0x0 +0x2 +0x4 +0x6 +0x8 +0xa +0xc +0xe +; ----------------------------------------------------------------------- +; sp : [&arg1 ][edi ][esi ][ebp ] +; sp+0x10: [esp ][ebx ][edx ][ecx ] +; sp+0x20: [eax ][flags ][ip ][cs ][arg1 ][arg2, ... +; call _pmm - mov bx, sp + mov bx, sp SEG SS - mov [bx+(4+7*4)], ax + mov [bx+0x20], ax SEG SS - mov [bx+(4+5*4)], dx - pop eax + mov [bx+0x18], dx + pop ebx popad - db 0xcb ;; lret + popf + retf #endif // BX_PMM ; parallel port detection: base address in DX, index in BX, timeout in CL |