| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <x86emu/x86emu.h> |
| #include <arch/interrupt.h> |
| #include <console/console.h> |
| |
| #include "int15.h" |
| |
| static int active_lfp, pfit, display, panel_type; |
| |
| int intel_vga_int15_handler(void) |
| { |
| int res = 0; |
| |
| printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n", |
| __func__, X86_AX, X86_BX, X86_CX, X86_DX); |
| |
| switch (X86_AX) { |
| case 0x5f34: |
| /* |
| * Set Panel Fitting Hook: |
| * bit 2 = Graphics Stretching |
| * bit 1 = Text Stretching |
| * bit 0 = Centering (do not set with bit1 or bit2) |
| * 0 = video BIOS default |
| */ |
| X86_AX = 0x005f; |
| X86_CX = pfit; |
| res = 1; |
| break; |
| case 0x5f35: |
| /* |
| * Boot Display Device Hook: |
| * bit 0 = CRT |
| * bit 1 = TV (eDP) * |
| * bit 2 = EFP * |
| * bit 3 = LFP |
| * bit 4 = CRT2 |
| * bit 5 = TV2 (eDP) * |
| * bit 6 = EFP2 * |
| * bit 7 = LFP2 |
| */ |
| X86_AX = 0x005f; |
| X86_CX = display; |
| res = 1; |
| break; |
| case 0x5f40: /* Boot Panel Type */ |
| X86_AX = 0x005f; // Success |
| X86_CL = panel_type; |
| printk(BIOS_DEBUG, "DISPLAY=%x\n", X86_CL); |
| res = 1; |
| break; |
| case 0x5f51: |
| /* |
| * Hook to select active LFP configuration: |
| * 00h = No LVDS, VBIOS does not enable LVDS |
| * 01h = Int-LVDS, LFP driven by integrated LVDS decoder |
| * 02h = SVDO-LVDS, LFP driven by SVDO decoder |
| * 03h = eDP, LFP Driven by Int-DisplayPort encoder |
| */ |
| X86_AX = 0x005f; |
| X86_CX = active_lfp; |
| res = 1; |
| break; |
| case 0x5f70: |
| switch ((X86_CX >> 8) & 0xff) { |
| case 0: |
| /* Get Mux */ |
| X86_AX = 0x005f; |
| X86_CX = 0x0000; |
| res = 1; |
| break; |
| case 1: |
| /* Set Mux */ |
| X86_AX = 0x005f; |
| X86_CX = 0x0000; |
| res = 1; |
| break; |
| case 2: |
| /* Get SG/Non-SG mode */ |
| X86_AX = 0x005f; |
| X86_CX = 0x0000; |
| res = 1; |
| break; |
| default: |
| /* Interrupt was not handled */ |
| printk(BIOS_DEBUG, |
| "Unknown INT15 5f70 function: 0x%02x\n", |
| ((X86_CX >> 8) & 0xff)); |
| break; |
| } |
| break; |
| |
| default: |
| printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", X86_AX); |
| break; |
| } |
| return res; |
| } |
| |
| void install_intel_vga_int15_handler(int active_lfp_, int pfit_, int display_, int panel_type_) |
| { |
| active_lfp = active_lfp_; |
| pfit = pfit_; |
| display = display_; |
| panel_type = panel_type_; |
| mainboard_interrupt_handlers(0x15, &intel_vga_int15_handler); |
| } |