6aabed1c77
- Remove CS and IP registers from x86bios.h. They have no use for us. - Adjust register dump to make it little bit more useful for debugging. Submitted by: paradox (ddkprog yahoo com)[1] (initial version)
197 lines
3.8 KiB
C
197 lines
3.8 KiB
C
/*-
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* Written by paradox <ddkprog@yahoo.com>
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* Public domain.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_x86bios.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/cpufunc.h>
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#include <contrib/x86emu/x86emu.h>
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#include <contrib/x86emu/x86emu_regs.h>
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#include <compat/x86bios/x86bios.h>
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u_char *pbiosMem = NULL;
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static u_char *pbiosStack = NULL;
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int busySegMap[5];
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static struct x86emu x86bios_emu;
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static struct mtx x86bios_lock;
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static uint8_t
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x86bios_emu_inb(struct x86emu *emu, uint16_t port)
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{
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if (port == 0xb2) /* APM scratch register */
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return (0);
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return (0);
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return (inb(port));
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}
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static uint16_t
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x86bios_emu_inw(struct x86emu *emu, uint16_t port)
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{
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return (0);
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return (inw(port));
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}
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static uint32_t
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x86bios_emu_inl(struct x86emu *emu, uint16_t port)
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{
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return (0);
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return (inl(port));
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}
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static void
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x86bios_emu_outb(struct x86emu *emu, uint16_t port, uint8_t val)
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{
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if (port == 0xb2) /* APM scratch register */
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return;
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return;
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outb(port, val);
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}
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static void
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x86bios_emu_outw(struct x86emu *emu, uint16_t port, uint16_t val)
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{
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return;
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outw(port, val);
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}
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static void
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x86bios_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val)
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{
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if (port >= 0x80 && port < 0x88) /* POST status register */
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return;
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outl(port, val);
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}
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void
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x86bios_intr(struct x86regs *regs, int intno)
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{
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if (intno < 0 || intno > 255)
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return;
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if (bootverbose)
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printf("Calling int 0x%x (ax=0x%04x bx=0x%04x "
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"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
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intno, regs->R_AX, regs->R_BX, regs->R_CX,
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regs->R_DX, regs->R_ES, regs->R_DI);
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mtx_lock_spin(&x86bios_lock);
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memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
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x86emu_exec_intr(&x86bios_emu, intno);
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memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
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mtx_unlock_spin(&x86bios_lock);
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if (bootverbose)
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printf("Exiting int 0x%x (ax=0x%04x bx=0x%04x "
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"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
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intno, regs->R_AX, regs->R_BX, regs->R_CX,
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regs->R_DX, regs->R_ES, regs->R_DI);
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}
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void *
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x86bios_offset(uint32_t offs)
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{
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return (pbiosMem + offs);
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}
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static void
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x86bios_init(void *arg __unused)
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{
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int offs;
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mtx_init(&x86bios_lock, "x86bios lock", NULL, MTX_SPIN);
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/* Can pbiosMem be NULL here? */
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pbiosMem = pmap_mapbios(0x0, MAPPED_MEMORY_SIZE);
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memset(&x86bios_emu, 0, sizeof(x86bios_emu));
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x86emu_init_default(&x86bios_emu);
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x86bios_emu.emu_inb = x86bios_emu_inb;
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x86bios_emu.emu_inw = x86bios_emu_inw;
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x86bios_emu.emu_inl = x86bios_emu_inl;
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x86bios_emu.emu_outb = x86bios_emu_outb;
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x86bios_emu.emu_outw = x86bios_emu_outw;
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x86bios_emu.emu_outl = x86bios_emu_outl;
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x86bios_emu.mem_base = (char *)pbiosMem;
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x86bios_emu.mem_size = MAPPED_MEMORY_SIZE;
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memset(busySegMap, 0, sizeof(busySegMap));
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pbiosStack = x86bios_alloc(1, &offs);
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}
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static void
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x86bios_uninit(void *arg __unused)
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{
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x86bios_free(pbiosStack, 1);
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if (pbiosMem)
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pmap_unmapdev((vm_offset_t)pbiosMem,
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MAPPED_MEMORY_SIZE);
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mtx_destroy(&x86bios_lock);
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}
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static int
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x86bios_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int err = 0;
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switch (type) {
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case MOD_LOAD:
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x86bios_init(NULL);
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break;
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case MOD_UNLOAD:
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x86bios_uninit(NULL);
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break;
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default:
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err = ENOTSUP;
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break;
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}
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return (err);
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}
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static moduledata_t x86bios_mod = {
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"x86bios",
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x86bios_modevent,
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NULL,
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};
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DECLARE_MODULE(x86bios, x86bios_mod, SI_SUB_CPU, SI_ORDER_ANY);
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MODULE_VERSION(x86bios, 1);
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