diff options
Diffstat (limited to 'config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch')
| -rw-r--r-- | config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch b/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch new file mode 100644 index 00000000..f05a34c2 --- /dev/null +++ b/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch @@ -0,0 +1,188 @@ +From 1e7c443d069ef817c4e699bd6675efff4ebddb86 Mon Sep 17 00:00:00 2001 +From: Riku Viitanen <riku.viitanen@protonmail.com> +Date: Sat, 10 Feb 2024 21:38:17 +0200 +Subject: [PATCH 2/2] vgahooks, optionroms: implement mxm 3.0 interrupts + +VGAROMs on MXM graphics cards need certain int15h functions present. + +Tested on a HP EliteBook 8560w with coreboot and Quadro 2000M. A warning +is displayed for 30 seconds and performance is nerfed: + + ERROR: Valid MXM Structure not found. + POST halted for 30 seconds, P-state limited to P10... + +This patch implements the minimum required on this system (and implemented +by the OEM BIOS): functions 0 and 1. + +These functions are specific to the MXM 3.0 Software Specification, +earlier versions are not implemented due to lack of hardware. Documentation +for versions 2.1 and 3.0 can be found freely online. + +Functions aren't specific to mainboards or GPUs (though some mainboards +could need more functions implemented). The structure is +mainboard-specific and is read from romfile "mxm-30-sis". + +It can be extracted from vendor BIOS by running those same interrupts. +I wrote a tool to do it on Linux: https://codeberg.org/Riku_V/mxmdump/ + +Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com> +--- + src/optionroms.c | 9 +++++++ + src/vgahooks.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++ + src/vgahooks.h | 9 +++++++ + 3 files changed, 87 insertions(+) + create mode 100644 src/vgahooks.h + +diff --git a/src/optionroms.c b/src/optionroms.c +index e906ab97..fcce7900 100644 +--- a/src/optionroms.c ++++ b/src/optionroms.c +@@ -22,6 +22,7 @@ + #include "string.h" // memset + #include "util.h" // get_pnp_offset + #include "tcgbios.h" // tpm_* ++#include "vgahooks.h" // MXM30SIS + + static int EnforceChecksum, S3ResumeVga, RunPCIroms; + +@@ -463,6 +464,14 @@ vgarom_setup(void) + RunPCIroms = romfile_loadint("etc/pci-optionrom-exec", 2); + ScreenAndDebug = romfile_loadint("etc/screen-and-debug", 1); + ++ // Load MXM 3.0 System Information Structure ++ void *mxm_sis = romfile_loadfile_g("mxm-30-sis", NULL, &malloc_low, 0); ++ if (mxm_sis) { ++ MXM30SIS = (u32)mxm_sis; ++ } else { ++ MXM30SIS = 0; ++ } ++ + // Clear option rom memory + memset((void*)BUILD_ROM_START, 0, rom_get_max() - BUILD_ROM_START); + +diff --git a/src/vgahooks.c b/src/vgahooks.c +index 1f149532..a94840b2 100644 +--- a/src/vgahooks.c ++++ b/src/vgahooks.c +@@ -18,8 +18,10 @@ + #define VH_VIA 1 + #define VH_INTEL 2 + #define VH_SMI 3 ++#define VH_MXM 4 + + int VGAHookHandlerType VARFSEG; ++u32 MXM30SIS VARFSEG; + + static void + handle_155fXX(struct bregs *regs) +@@ -59,6 +61,7 @@ via_155f02(struct bregs *regs) + dprintf(1, "Warning: VGA TV/CRT output type is hardcoded\n"); + } + ++ + static void + via_155f18(struct bregs *regs) + { +@@ -296,6 +299,69 @@ winent_mb6047_setup(struct pci_device *pci) + SmiBootDisplay = 0x02; + } + ++/**************************************************************** ++ * MXM VGA hooks ++ ****************************************************************/ ++ ++// Function 0: Return Specification Support Level ++static void ++mxm_V30_F00(struct bregs *regs) ++{ ++ regs->ax = 0x005f; // Success ++ regs->bl = 0x30; // MXM 3.0 ++ regs->cx = 0x0003; // Supported Functions ++ set_success(regs); ++} ++ ++// Function 1: Return a Pointer to the MXM Structure ++static void ++mxm_V30_F01(struct bregs *regs) ++{ ++ switch (regs->cx) { ++ case 0x0030: ++ regs->ax = 0x005f; // Success ++ regs->es = GET_GLOBAL(MXM30SIS)/16; ++ regs->di = GET_GLOBAL(MXM30SIS)%16; ++ set_success(regs); ++ break; ++ default: ++ handle_155fXX(regs); ++ break; ++ } ++} ++ ++static void ++mxm_V30(struct bregs *regs) ++{ ++ switch (regs->bx) { ++ case 0xff00: mxm_V30_F00(regs); break; ++ case 0xff01: mxm_V30_F01(regs); break; ++ default: handle_155fXX(regs); break; ++ } ++} ++ ++static void ++mxm_155f80(struct bregs *regs) ++{ ++ // TODO: implement other versions, like 2.1 ++ mxm_V30(regs); ++} ++ ++static void ++mxm_155f(struct bregs *regs) ++{ ++ switch (regs->al) { ++ case 0x80: mxm_155f80(regs); break; ++ default: handle_155fXX(regs); break; ++ } ++} ++ ++void ++mxm_setup(void) ++{ ++ VGAHookHandlerType = VH_MXM; ++} ++ + /**************************************************************** + * Entry and setup + ****************************************************************/ +@@ -313,6 +379,7 @@ handle_155f(struct bregs *regs) + switch (htype) { + case VH_VIA: via_155f(regs); break; + case VH_INTEL: intel_155f(regs); break; ++ case VH_MXM: mxm_155f(regs); break; + default: handle_155fXX(regs); break; + } + } +@@ -352,4 +419,6 @@ vgahook_setup(struct pci_device *pci) + via_setup(pci); + else if (pci->vendor == PCI_VENDOR_ID_INTEL) + intel_setup(pci); ++ else if (GET_GLOBAL(MXM30SIS)) ++ mxm_setup(); + } +diff --git a/src/vgahooks.h b/src/vgahooks.h +new file mode 100644 +index 00000000..f0c203af +--- /dev/null ++++ b/src/vgahooks.h +@@ -0,0 +1,9 @@ ++#ifndef __VGAHOOKS_H ++#define __VGAHOOKS_H ++ ++#include "types.h" // u32 ++ ++extern u32 MXM30SIS; ++ ++ ++#endif // vgahooks.h +-- +2.43.0 + |