/* SPDX-License-Identifier: GPL-2.0-only */ #include <arch/interrupt.h> #include <console/console.h> #include <soc/int15.h> #include <x86emu/x86emu.h> static int int15_handler(void) { int res = 1; 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 = 0x0001; res = 1; break; case 0x5f35: /* * Boot Display Device Hook: * bit 0 = CRT * bit 1 = TV * bit 2 = EFP (HDMI) * bit 3 = LFP (eDP)* * bit 4 = CRT2 * bit 5 = TV2 * bit 6 = EFP2 * bit 7 = LFP2 */ X86_AX = 0x005f; X86_CX = 0x0008; 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 = 0x0003; 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_baytrail_vga_int15_handler(void) { mainboard_interrupt_handlers(0x15, &int15_handler); }