src/drivers/intel/gma/int15.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <x86emu/x86emu.h>
   4 #include <arch/interrupt.h>
   5 #include <console/console.h>
   6
   7 #include "int15.h"
   8
   9 static int active_lfp, pfit, display, panel_type;
  10
  11 int intel_vga_int15_handler(void)
  12 {
  13         int res = 0;
  14
  15         printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
  16                __func__, X86_AX, X86_BX, X86_CX, X86_DX);
  17
  18         switch (X86_AX) {
  19         case 0x5f34:
  20                 /*
  21                  * Set Panel Fitting Hook:
  22                  *  bit 2 = Graphics Stretching
  23                  *  bit 1 = Text Stretching
  24                  *  bit 0 = Centering (do not set with bit1 or bit2)
  25                  *  0     = video BIOS default
  26                  */
  27                 X86_AX = 0x005f;
  28                 X86_CX = pfit;
  29                 res = 1;
  30                 break;
  31         case 0x5f35:
  32                 /*
  33                  * Boot Display Device Hook:
  34                  *  bit 0 = CRT
  35                  *  bit 1 = TV (eDP) *
  36                  *  bit 2 = EFP *
  37                  *  bit 3 = LFP
  38                  *  bit 4 = CRT2
  39                  *  bit 5 = TV2 (eDP) *
  40                  *  bit 6 = EFP2 *
  41                  *  bit 7 = LFP2
  42                  */
  43                 X86_AX = 0x005f;
  44                 X86_CX = display;
  45                 res = 1;
  46                 break;
  47         case 0x5f40: /* Boot Panel Type */
  48                 X86_AX = 0x005f; // Success
  49                 X86_CL = panel_type;
  50                 printk(BIOS_DEBUG, "DISPLAY=%x\n", X86_CL);
  51                 res = 1;
  52                 break;
  53         case 0x5f51:
  54                 /*
  55                  * Hook to select active LFP configuration:
  56                  *  00h = No LVDS, VBIOS does not enable LVDS
  57                  *  01h = Int-LVDS, LFP driven by integrated LVDS decoder
  58                  *  02h = SVDO-LVDS, LFP driven by SVDO decoder
  59                  *  03h = eDP, LFP Driven by Int-DisplayPort encoder
  60                  */
  61                 X86_AX = 0x005f;
  62                 X86_CX = active_lfp;
  63                 res = 1;
  64                 break;
  65         case 0x5f70:
  66                 switch ((X86_CX >> 8) & 0xff) {
  67                 case 0:
  68                         /* Get Mux */
  69                         X86_AX = 0x005f;
  70                         X86_CX = 0x0000;
  71                         res = 1;
  72                         break;
  73                 case 1:
  74                         /* Set Mux */
  75                         X86_AX = 0x005f;
  76                         X86_CX = 0x0000;
  77                         res = 1;
  78                         break;
  79                 case 2:
  80                         /* Get SG/Non-SG mode */
  81                         X86_AX = 0x005f;
  82                         X86_CX = 0x0000;
  83                         res = 1;
  84                         break;
  85                 default:
  86                         /* Interrupt was not handled */
  87                         printk(BIOS_DEBUG,
  88                                "Unknown INT15 5f70 function: 0x%02x\n",
  89                                 ((X86_CX >> 8) & 0xff));
  90                         break;
  91                 }
  92                 break;
  93
  94         default:
  95                 printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", X86_AX);
  96                 break;
  97         }
  98         return res;
  99 }
 100
 101 void install_intel_vga_int15_handler(int active_lfp_, int pfit_, int display_, int panel_type_)
 102 {
 103         active_lfp = active_lfp_;
 104         pfit = pfit_;
 105         display = display_;
 106         panel_type = panel_type_;
 107         mainboard_interrupt_handlers(0x15, &intel_vga_int15_handler);
 108 }