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/*
* From Coreboot
*
* Copyright (C) 2001 Ronald G. Minnich
* Copyright (C) 2005 Nick.Barker9@btinternet.com
* Copyright (C) 2007-2009 coresystems GmbH
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <asm/pci.h>
#include "bios_emul.h"
/* errors go in AH. Just set these up so that word assigns will work */
enum {
PCIBIOS_SUCCESSFUL = 0x0000,
PCIBIOS_UNSUPPORTED = 0x8100,
PCIBIOS_BADVENDOR = 0x8300,
PCIBIOS_NODEV = 0x8600,
PCIBIOS_BADREG = 0x8700
};
int int10_handler(void)
{
static u8 cursor_row, cursor_col;
int res = 0;
switch ((M.x86.R_EAX & 0xff00) >> 8) {
case 0x01: /* Set cursor shape */
res = 1;
break;
case 0x02: /* Set cursor position */
if (cursor_row != ((M.x86.R_EDX >> 8) & 0xff) ||
cursor_col >= (M.x86.R_EDX & 0xff)) {
debug("\n");
}
cursor_row = (M.x86.R_EDX >> 8) & 0xff;
cursor_col = M.x86.R_EDX & 0xff;
res = 1;
break;
case 0x03: /* Get cursor position */
M.x86.R_EAX &= 0x00ff;
M.x86.R_ECX = 0x0607;
M.x86.R_EDX = (cursor_row << 8) | cursor_col;
res = 1;
break;
case 0x06: /* Scroll up */
debug("\n");
res = 1;
break;
case 0x08: /* Get Character and Mode at Cursor Position */
M.x86.R_EAX = 0x0f00 | 'A'; /* White on black 'A' */
res = 1;
break;
case 0x09: /* Write Character and attribute */
case 0x0e: /* Write Character */
debug("%c", M.x86.R_EAX & 0xff);
res = 1;
break;
case 0x0f: /* Get video mode */
M.x86.R_EAX = 0x5002; /*80 x 25 */
M.x86.R_EBX &= 0x00ff;
res = 1;
break;
default:
printf("Unknown INT10 function %04x\n", M.x86.R_EAX & 0xffff);
break;
}
return res;
}
int int12_handler(void)
{
M.x86.R_EAX = 64 * 1024;
return 1;
}
int int16_handler(void)
{
int res = 0;
switch ((M.x86.R_EAX & 0xff00) >> 8) {
case 0x00: /* Check for Keystroke */
M.x86.R_EAX = 0x6120; /* Space Bar, Space */
res = 1;
break;
case 0x01: /* Check for Keystroke */
M.x86.R_EFLG |= 1 << 6; /* Zero Flag set (no key available) */
res = 1;
break;
default:
printf("Unknown INT16 function %04x\n", M.x86.R_EAX & 0xffff);
break;
}
return res;
}
#define PCI_CONFIG_SPACE_TYPE1 (1 << 0)
#define PCI_SPECIAL_CYCLE_TYPE1 (1 << 4)
int int1a_handler(void)
{
unsigned short func = (unsigned short)M.x86.R_EAX;
int retval = 1;
unsigned short devid, vendorid, devfn;
/* Use short to get rid of gabage in upper half of 32-bit register */
short devindex;
unsigned char bus;
pci_dev_t dev;
u32 dword;
u16 word;
u8 byte, reg;
switch (func) {
case 0xb101: /* PCIBIOS Check */
M.x86.R_EDX = 0x20494350; /* ' ICP' */
M.x86.R_EAX &= 0xffff0000; /* Clear AH / AL */
M.x86.R_EAX |= PCI_CONFIG_SPACE_TYPE1 |
PCI_SPECIAL_CYCLE_TYPE1;
/*
* last bus in the system. Hard code to 255 for now.
* dev_enumerate() does not seem to tell us (publically)
*/
M.x86.R_ECX = 0xff;
M.x86.R_EDI = 0x00000000; /* protected mode entry */
retval = 1;
break;
case 0xb102: /* Find Device */
devid = M.x86.R_ECX;
vendorid = M.x86.R_EDX;
devindex = M.x86.R_ESI;
dev = pci_find_device(vendorid, devid, devindex);
if (dev != -1) {
unsigned short busdevfn;
M.x86.R_EAX &= 0xffff00ff; /* Clear AH */
M.x86.R_EAX |= PCIBIOS_SUCCESSFUL;
/*
* busnum is an unsigned char;
* devfn is an int, so we mask it off.
*/
busdevfn = (PCI_BUS(dev) << 8) | PCI_DEV(dev) << 3 |
PCI_FUNC(dev);
debug("0x%x: return 0x%x\n", func, busdevfn);
M.x86.R_EBX = busdevfn;
retval = 1;
} else {
M.x86.R_EAX &= 0xffff00ff; /* Clear AH */
M.x86.R_EAX |= PCIBIOS_NODEV;
retval = 0;
}
break;
case 0xb10a: /* Read Config Dword */
case 0xb109: /* Read Config Word */
case 0xb108: /* Read Config Byte */
case 0xb10d: /* Write Config Dword */
case 0xb10c: /* Write Config Word */
case 0xb10b: /* Write Config Byte */
devfn = M.x86.R_EBX & 0xff;
bus = M.x86.R_EBX >> 8;
reg = M.x86.R_EDI;
dev = PCI_BDF(bus, devfn >> 3, devfn & 7);
switch (func) {
case 0xb108: /* Read Config Byte */
byte = x86_pci_read_config8(dev, reg);
M.x86.R_ECX = byte;
break;
case 0xb109: /* Read Config Word */
word = x86_pci_read_config16(dev, reg);
M.x86.R_ECX = word;
break;
case 0xb10a: /* Read Config Dword */
dword = x86_pci_read_config32(dev, reg);
M.x86.R_ECX = dword;
break;
case 0xb10b: /* Write Config Byte */
byte = M.x86.R_ECX;
x86_pci_write_config8(dev, reg, byte);
break;
case 0xb10c: /* Write Config Word */
word = M.x86.R_ECX;
x86_pci_write_config16(dev, reg, word);
break;
case 0xb10d: /* Write Config Dword */
dword = M.x86.R_ECX;
x86_pci_write_config32(dev, reg, dword);
break;
}
#ifdef CONFIG_REALMODE_DEBUG
debug("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%x\n", func,
bus, devfn, reg, M.x86.R_ECX);
#endif
M.x86.R_EAX &= 0xffff00ff; /* Clear AH */
M.x86.R_EAX |= PCIBIOS_SUCCESSFUL;
retval = 1;
break;
default:
printf("UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
M.x86.R_EAX &= 0xffff00ff; /* Clear AH */
M.x86.R_EAX |= PCIBIOS_UNSUPPORTED;
retval = 0;
break;
}
return retval;
}
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