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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/device.h>
#include <console/console.h>
#if CONFIG(VGA_ROM_RUN)
#include <x86emu/x86emu.h>
#endif
#include <arch/interrupt.h>
#if CONFIG(VGA_ROM_RUN)
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;
}
#endif
// mainboard_enable is executed as first thing after
// enumerate_buses().
static void mainboard_enable(struct device *dev)
{
#if CONFIG(VGA_ROM_RUN)
/* Install custom int15 handler for VGA OPROM */
mainboard_interrupt_handlers(0x15, &int15_handler);
#endif
}
struct chip_operations mainboard_ops = {
.enable_dev = mainboard_enable,
};
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