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/* $OpenBSD: vga_post.c,v 1.5 2012/12/05 23:20:12 deraadt Exp $ */
/* $NetBSD: vga_post.c,v 1.12 2009/03/15 21:32:36 cegger Exp $ */
/*-
* Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm_page.h>
#include <machine/pio.h>
#include <machine/vga_post.h>
#include <dev/x86emu/x86emu.h>
#include <dev/x86emu/x86emu_regs.h>
#define BASE_MEMORY 65536 /* How much memory to allocate in Real Mode */
struct vga_post {
struct x86emu emu;
vaddr_t sys_image;
uint32_t initial_eax;
uint8_t bios_data[PAGE_SIZE];
struct pglist ram_backing;
};
#ifdef DDB
struct vga_post *ddb_vgapostp;
void ddb_vgapost(void);
#endif
static uint8_t
vm86_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
vm86_emu_inw(struct x86emu *emu, uint16_t port)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return 0;
return inw(port);
}
static uint32_t
vm86_emu_inl(struct x86emu *emu, uint16_t port)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return 0;
return inl(port);
}
static void
vm86_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
vm86_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
vm86_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val)
{
if (port >= 0x80 && port < 0x88) /* POST status register */
return;
outl(port, val);
}
struct vga_post *
vga_post_init(int bus, int device, int function)
{
struct vga_post *sc;
vaddr_t iter;
struct vm_page *pg;
vaddr_t sys_image, sys_bios_data;
int err;
sys_bios_data = uvm_km_valloc(kernel_map, PAGE_SIZE);
if (sys_bios_data == 0)
return NULL;
sys_image = uvm_km_valloc(kernel_map, 1024 * 1024);
if (sys_image == 0) {
uvm_km_free(kernel_map, sys_bios_data, PAGE_SIZE);
return NULL;
}
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
TAILQ_INIT(&sc->ram_backing);
err = uvm_pglistalloc(BASE_MEMORY, 0, (paddr_t)-1, 0, 0,
&sc->ram_backing, BASE_MEMORY/PAGE_SIZE, UVM_PLA_WAITOK);
if (err) {
uvm_km_free(kernel_map, sc->sys_image, 1024 * 1024);
free(sc, M_DEVBUF);
return NULL;
}
sc->sys_image = sys_image;
sc->emu.sys_private = sc;
pmap_kenter_pa(sys_bios_data, 0, VM_PROT_READ);
pmap_update(pmap_kernel());
memcpy((void *)sc->bios_data, (void *)sys_bios_data, PAGE_SIZE);
pmap_kremove(sys_bios_data, PAGE_SIZE);
uvm_km_free(kernel_map, sys_bios_data, PAGE_SIZE);
iter = 0;
TAILQ_FOREACH(pg, &sc->ram_backing, pageq) {
pmap_kenter_pa(sc->sys_image + iter, VM_PAGE_TO_PHYS(pg),
VM_PROT_READ | VM_PROT_WRITE);
iter += PAGE_SIZE;
}
KASSERT(iter == BASE_MEMORY);
for (iter = 640 * 1024; iter < 1024 * 1024; iter += PAGE_SIZE)
pmap_kenter_pa(sc->sys_image + iter, iter,
VM_PROT_READ | VM_PROT_WRITE);
pmap_update(pmap_kernel());
memset(&sc->emu, 0, sizeof(sc->emu));
x86emu_init_default(&sc->emu);
sc->emu.emu_inb = vm86_emu_inb;
sc->emu.emu_inw = vm86_emu_inw;
sc->emu.emu_inl = vm86_emu_inl;
sc->emu.emu_outb = vm86_emu_outb;
sc->emu.emu_outw = vm86_emu_outw;
sc->emu.emu_outl = vm86_emu_outl;
sc->emu.mem_base = (char *)sc->sys_image;
sc->emu.mem_size = 1024 * 1024;
sc->initial_eax = bus * 256 + device * 8 + function;
#ifdef DDB
ddb_vgapostp = sc;
#endif
return sc;
}
void
vga_post_call(struct vga_post *sc)
{
sc->emu.x86.R_EAX = sc->initial_eax;
sc->emu.x86.R_EDX = 0x00000080;
sc->emu.x86.R_DS = 0x0040;
sc->emu.x86.register_flags = 0x3200;
memcpy((void *)sc->sys_image, sc->bios_data, PAGE_SIZE);
/* stack is at the end of the first 64KB */
sc->emu.x86.R_SS = 0;
sc->emu.x86.R_ESP = 0;
/* Jump straight into the VGA BIOS POST code */
x86emu_exec_call(&sc->emu, 0xc000, 0x0003);
}
void
vga_post_free(struct vga_post *sc)
{
uvm_pglistfree(&sc->ram_backing);
pmap_kremove(sc->sys_image, 1024 * 1024);
uvm_km_free(kernel_map, sc->sys_image, 1024 * 1024);
pmap_update(pmap_kernel());
free(sc, M_DEVBUF);
}
#ifdef DDB
void
ddb_vgapost(void)
{
if (ddb_vgapostp)
vga_post_call(ddb_vgapostp);
else
printf("ddb_vgapost: vga_post not initialized\n");
}
#endif
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