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[FREELDR] Save used register when calling PNPBIOS

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Jérôme Gardou 2021-04-12 14:16:49 +02:00 committed by Jérôme Gardou
parent 2bf116359b
commit d55276aad9
1 changed files with 7 additions and 3 deletions
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10
boot/freeldr/freeldr/arch/amd64/pnpbios.S
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@ -104,7 +104,8 @@ pnp_not_found:
PUBLIC PnpBiosGetDeviceNodeCount PUBLIC PnpBiosGetDeviceNodeCount
PnpBiosGetDeviceNodeCount: PnpBiosGetDeviceNodeCount:
/* Save param-regs */ /* Save registers */
push rbx
push rcx push rcx
push rdx push rdx
@ -115,6 +116,7 @@ PnpBiosGetDeviceNodeCount:
/* Restore param-regs */ /* Restore param-regs */
pop rdx pop rdx
pop rcx pop rcx
pop rbx
xor eax, eax xor eax, eax
mov ax, [BSS_PnpNodeSize] mov ax, [BSS_PnpNodeSize]
@ -148,14 +150,16 @@ PnpBiosGetDeviceNode:
and eax, HEX(0f) and eax, HEX(0f)
mov word ptr [BSS_PnpBiosBufferOffset], ax mov word ptr [BSS_PnpBiosBufferOffset], ax
/* Save rcx */ /* Save registers */
push rcx push rcx
push rbx
/* Call the real mode function */ /* Call the real mode function */
mov bx, FNID_PnpBiosGetDeviceNode mov bx, FNID_PnpBiosGetDeviceNode
call CallRealMode call CallRealMode
/* Restore rcx */ /* Restore registers */
pop rbx
pop rcx pop rcx
/* update node number */ /* update node number */