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/*-
* Written by paradox <ddkprog@yahoo.com>
* Public domain.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_x86bios.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/cpufunc.h>
#include <contrib/x86emu/x86emu.h>
#include <contrib/x86emu/x86emu_regs.h>
#include <compat/x86bios/x86bios.h>
u_char *pbiosMem = NULL;
static u_char *pbiosStack = NULL;
int busySegMap[5];
static struct x86emu x86bios_emu;
static struct mtx x86bios_lock;
static uint8_t
x86bios_emu_inb(struct x86emu *emu, uint16_t port)
{
if (port == 0xb2) /* APM scratch register */
return (0);
if (port >= 0x80 && port < 0x88) /* POST status register */
return (0);
return (inb(port));
}
static uint16_t
x86bios_emu_inw(struct x86emu *emu, uint16_t port)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return (0);
return (inw(port));
}
static uint32_t
x86bios_emu_inl(struct x86emu *emu, uint16_t port)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return (0);
return (inl(port));
}
static void
x86bios_emu_outb(struct x86emu *emu, uint16_t port, uint8_t val)
{
if (port == 0xb2) /* APM scratch register */
return;
if (port >= 0x80 && port < 0x88) /* POST status register */
return;
outb(port, val);
}
static void
x86bios_emu_outw(struct x86emu *emu, uint16_t port, uint16_t val)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return;
outw(port, val);
}
static void
x86bios_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return;
outl(port, val);
}
void
x86bios_intr(struct x86regs *regs, int intno)
{
if (intno < 0 || intno > 255)
return;
if (bootverbose)
printf("Calling int 0x%x (ax=0x%04x bx=0x%04x "
"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
intno, regs->R_AX, regs->R_BX, regs->R_CX,
regs->R_DX, regs->R_ES, regs->R_DI);
mtx_lock_spin(&x86bios_lock);
memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
x86emu_exec_intr(&x86bios_emu, intno);
memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
mtx_unlock_spin(&x86bios_lock);
if (bootverbose)
printf("Exiting int 0x%x (ax=0x%04x bx=0x%04x "
"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
intno, regs->R_AX, regs->R_BX, regs->R_CX,
regs->R_DX, regs->R_ES, regs->R_DI);
}
void *
x86bios_offset(uint32_t offs)
{
return (pbiosMem + offs);
}
static void
x86bios_init(void *arg __unused)
{
int offs;
mtx_init(&x86bios_lock, "x86bios lock", NULL, MTX_SPIN);
/* Can pbiosMem be NULL here? */
pbiosMem = pmap_mapbios(0x0, MAPPED_MEMORY_SIZE);
memset(&x86bios_emu, 0, sizeof(x86bios_emu));
x86emu_init_default(&x86bios_emu);
x86bios_emu.emu_inb = x86bios_emu_inb;
x86bios_emu.emu_inw = x86bios_emu_inw;
x86bios_emu.emu_inl = x86bios_emu_inl;
x86bios_emu.emu_outb = x86bios_emu_outb;
x86bios_emu.emu_outw = x86bios_emu_outw;
x86bios_emu.emu_outl = x86bios_emu_outl;
x86bios_emu.mem_base = (char *)pbiosMem;
x86bios_emu.mem_size = MAPPED_MEMORY_SIZE;
memset(busySegMap, 0, sizeof(busySegMap));
pbiosStack = x86bios_alloc(1, &offs);
}
static void
x86bios_uninit(void *arg __unused)
{
x86bios_free(pbiosStack, 1);
if (pbiosMem)
pmap_unmapdev((vm_offset_t)pbiosMem,
MAPPED_MEMORY_SIZE);
mtx_destroy(&x86bios_lock);
}
static int
x86bios_modevent(module_t mod __unused, int type, void *data __unused)
{
int err = 0;
switch (type) {
case MOD_LOAD:
x86bios_init(NULL);
break;
case MOD_UNLOAD:
x86bios_uninit(NULL);
break;
default:
err = ENOTSUP;
break;
}
return (err);
}
static moduledata_t x86bios_mod = {
"x86bios",
x86bios_modevent,
NULL,
};
DECLARE_MODULE(x86bios, x86bios_mod, SI_SUB_CPU, SI_ORDER_ANY);
MODULE_VERSION(x86bios, 1);
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