+++ /dev/null
-/*
- * setup.c: Setup the world for vmxassist.
- *
- * Leendert van Doorn, leendert@watson.ibm.com
- * Copyright (c) 2005, International Business Machines Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- */
-#include "vm86.h"
-#include "util.h"
-#include "machine.h"
-
-#if (VMXASSIST_BASE != TEXTADDR)
-#error VMXAssist base mismatch
-#endif
-
-#define NR_PGD (PGSIZE / sizeof(unsigned))
-
-#define min(a, b) ((a) > (b) ? (b) : (a))
-
-/* Which CPU are we booting, and what is the initial CS segment? */
-int booting_cpu, booting_vector;
-
-unsigned long long gdt[] __attribute__ ((aligned(32))) = {
- 0x0000000000000000ULL, /* 0x00: reserved */
- 0x0000890000000000ULL, /* 0x08: 32-bit TSS */
- 0x00CF9A000000FFFFULL, /* 0x10: CS 32-bit */
- 0x00CF92000000FFFFULL, /* 0x18: DS 32-bit */
-};
-
-struct dtr gdtr = { sizeof(gdt)-1, (unsigned long) &gdt };
-
-struct tss tss __attribute__ ((aligned(4)));
-
-unsigned long long idt[NR_TRAPS] __attribute__ ((aligned(32)));
-
-struct dtr idtr = { sizeof(idt)-1, (unsigned long) &idt };
-
-#ifdef TEST
-unsigned pgd[NR_PGD] __attribute__ ((aligned(PGSIZE))) = { 0 };
-
-struct e820entry e820map[] = {
- { 0x0000000000000000ULL, 0x000000000009F800ULL, E820_RAM },
- { 0x000000000009F800ULL, 0x0000000000000800ULL, E820_RESERVED },
- { 0x00000000000A0000ULL, 0x0000000000020000ULL, E820_IO },
- { 0x00000000000C0000ULL, 0x0000000000040000ULL, E820_RESERVED },
- { 0x0000000000100000ULL, 0x0000000000000000ULL, E820_RAM },
- { 0x0000000000000000ULL, 0x0000000000001000ULL, E820_SHARED_PAGE },
- { 0x0000000000000000ULL, 0x0000000000003000ULL, E820_NVS },
- { 0x0000000000003000ULL, 0x000000000000A000ULL, E820_ACPI },
- { 0x00000000FEC00000ULL, 0x0000000001400000ULL, E820_IO },
-};
-#endif /* TEST */
-
-struct vmx_assist_context oldctx;
-struct vmx_assist_context newctx;
-
-unsigned long memory_size;
-int initialize_real_mode;
-
-extern char stack[], stack_top[];
-extern unsigned trap_handlers[];
-
-void
-banner(void)
-{
- printf("VMXAssist (%s)\n", __DATE__);
-
- /* Bochs its way to convey memory size */
- memory_size = ((get_cmos(0x35) << 8) | get_cmos(0x34)) << 6;
- if (memory_size > 0x3bc000)
- memory_size = 0x3bc000;
- memory_size = (memory_size << 10) + 0xF00000;
- if (memory_size <= 0xF00000)
- memory_size =
- (((get_cmos(0x31) << 8) | get_cmos(0x30)) + 0x400) << 10;
- memory_size += 0x400 << 10; /* + 1MB */
-
-#ifdef TEST
- /* Create an SMAP for our debug environment */
- e820map[4].size = memory_size - e820map[4].addr - PGSIZE;
- e820map[5].addr = memory_size - PGSIZE;
- e820map[6].addr = memory_size;
- e820map[7].addr += memory_size;
-
- *E820_MAP_NR = sizeof(e820map)/sizeof(e820map[0]);
- memcpy(E820_MAP, e820map, sizeof(e820map));
-#endif
-
- printf("Memory size %ld MB\n", memory_size >> 20);
- printf("E820 map:\n");
- print_e820_map(E820_MAP, *E820_MAP_NR);
- printf("\n");
-}
-
-#ifdef TEST
-void
-setup_paging(void)
-{
- unsigned long i;
-
- if (((unsigned)pgd & ~PGMASK) != 0)
- panic("PGD not page aligned");
- set_cr4(get_cr4() | CR4_PSE);
- for (i = 0; i < NR_PGD; i++)
- pgd[i] = (i * LPGSIZE)| PTE_PS | PTE_US | PTE_RW | PTE_P;
- set_cr3((unsigned) pgd);
- set_cr0(get_cr0() | (CR0_PE|CR0_PG));
-}
-#endif /* TEST */
-
-void
-setup_gdt(void)
-{
- unsigned long long addr = (unsigned long long) &tss;
-
- /* setup task state segment */
- memset(&tss, 0, sizeof(tss));
- tss.ss0 = DATA_SELECTOR;
- tss.esp0 = (unsigned) stack_top - 4*4;
- tss.iomap_base = offsetof(struct tss, iomap);
-
- /* initialize gdt's tss selector */
- gdt[TSS_SELECTOR / sizeof(gdt[0])] |=
- ((addr & 0xFF000000) << (56-24)) |
- ((addr & 0x00FF0000) << (32-16)) |
- ((addr & 0x0000FFFF) << (16)) |
- (sizeof(tss) - 1);
-
- /* switch to our own gdt and set current tss */
- __asm__ __volatile__ ("lgdt %0" : : "m" (gdtr));
- __asm__ __volatile__ ("movl %%eax,%%ds;"
- "movl %%eax,%%es;"
- "movl %%eax,%%fs;"
- "movl %%eax,%%gs;"
- "movl %%eax,%%ss" : : "a" (DATA_SELECTOR));
-
- __asm__ __volatile__ ("ljmp %0,$1f; 1:" : : "i" (CODE_SELECTOR));
-
- __asm__ __volatile__ ("ltr %%ax" : : "a" (TSS_SELECTOR));
-}
-
-void
-set_intr_gate(int i, unsigned handler)
-{
- unsigned long long addr = handler;
-
- idt[i] = ((addr & 0xFFFF0000ULL) << 32) | (0x8E00ULL << 32) |
- (addr & 0xFFFFULL) | (CODE_SELECTOR << 16);
-}
-
-void
-setup_idt(void)
-{
- int i;
-
- for (i = 0; i < NR_TRAPS; i++)
- set_intr_gate(i, trap_handlers[i]);
- __asm__ __volatile__ ("lidt %0" : : "m" (idtr));
-}
-
-void
-setup_pic(void)
-{
- /* mask all interrupts */
- outb(PIC_MASTER + PIC_IMR, 0xFF);
- outb(PIC_SLAVE + PIC_IMR, 0xFF);
-
- /* setup master PIC */
- outb(PIC_MASTER + PIC_CMD, 0x11); /* edge triggered, cascade, ICW4 */
- outb(PIC_MASTER + PIC_IMR, NR_EXCEPTION_HANDLER);
- outb(PIC_MASTER + PIC_IMR, 1 << 2); /* slave on channel 2 */
- outb(PIC_MASTER + PIC_IMR, 0x01);
-
- /* setup slave PIC */
- outb(PIC_SLAVE + PIC_CMD, 0x11); /* edge triggered, cascade, ICW4 */
- outb(PIC_SLAVE + PIC_IMR, NR_EXCEPTION_HANDLER + 8);
- outb(PIC_SLAVE + PIC_IMR, 0x02); /* slave identity is 2 */
- outb(PIC_SLAVE + PIC_IMR, 0x01);
-
- /* enable all interrupts */
- outb(PIC_MASTER + PIC_IMR, 0);
- outb(PIC_SLAVE + PIC_IMR, 0);
-}
-
-void
-setiomap(int port)
-{
- tss.iomap[port >> 3] |= 1 << (port & 7);
-}
-
-void
-enter_real_mode(struct regs *regs)
-{
- /* mask off TSS busy bit */
- gdt[TSS_SELECTOR / sizeof(gdt[0])] &= ~0x0000020000000000ULL;
-
- /* start 8086 emulation of BIOS */
- if (initialize_real_mode) {
- initialize_real_mode = 0;
- regs->eflags |= EFLAGS_VM | 0x02;
- regs->ves = regs->vds = regs->vfs = regs->vgs = 0xF000;
- if (booting_cpu == 0) {
- regs->cs = 0xF000; /* ROM BIOS POST entry point */
-#ifdef TEST
- regs->eip = 0xFFE0;
-#else
- regs->eip = 0xFFF0;
-#endif
- } else {
- regs->cs = booting_vector << 8; /* AP entry point */
- regs->eip = 0;
- }
- regs->uesp = 0;
- regs->uss = 0;
-
- /* intercept accesses to the PIC */
- setiomap(PIC_MASTER+PIC_CMD);
- setiomap(PIC_MASTER+PIC_IMR);
- setiomap(PIC_SLAVE+PIC_CMD);
- setiomap(PIC_SLAVE+PIC_IMR);
-
- printf("Starting emulated 16-bit real-mode: ip=%04x:%04x\n",
- regs->cs, regs->eip);
-
- mode = VM86_REAL; /* becomes previous mode */
- set_mode(regs, VM86_REAL);
-
- /* this should get us into 16-bit mode */
- return;
- } else {
- /* go from protected to real mode */
- regs->eflags |= EFLAGS_VM;
-
- set_mode(regs, VM86_PROTECTED_TO_REAL);
-
- emulate(regs);
- }
-}
-
-/*
- * Setup the environment for VMX assist.
- * This environment consists of flat segments (code and data),
- * its own gdt, idt, and tr.
- */
-void
-setup_ctx(void)
-{
- struct vmx_assist_context *c = &newctx;
-
- memset(c, 0, sizeof(*c));
- c->eip = (unsigned long) switch_to_real_mode;
- c->esp = (unsigned) stack_top - 4*4;
- c->eflags = 0x2; /* no interrupts, please */
-
- /*
- * Obviously, vmx assist is not running with CR0_PE disabled.
- * The reason why the vmx assist cr0 has CR0.PE disabled is
- * that a transtion to CR0.PE causes a world switch. It seems
- * more natural to enable CR0.PE to cause a world switch to
- * protected mode rather than disabling it.
- */
-#ifdef TEST
- c->cr0 = (get_cr0() | CR0_NE | CR0_PG) & ~CR0_PE;
- c->cr3 = (unsigned long) pgd;
-#else
- c->cr0 = (get_cr0() | CR0_NE) & ~CR0_PE;
- c->cr3 = 0;
-#endif
- c->cr4 = get_cr4();
-
- c->idtr_limit = sizeof(idt)-1;
- c->idtr_base = (unsigned long) &idt;
-
- c->gdtr_limit = sizeof(gdt)-1;
- c->gdtr_base = (unsigned long) &gdt;
-
- c->cs_sel = CODE_SELECTOR;
- c->cs_limit = 0xFFFFFFFF;
- c->cs_base = 0;
- c->cs_arbytes.fields.seg_type = 0xb;
- c->cs_arbytes.fields.s = 1;
- c->cs_arbytes.fields.dpl = 0;
- c->cs_arbytes.fields.p = 1;
- c->cs_arbytes.fields.avl = 0;
- c->cs_arbytes.fields.default_ops_size = 1;
- c->cs_arbytes.fields.g = 1;
-
- c->ds_sel = DATA_SELECTOR;
- c->ds_limit = 0xFFFFFFFF;
- c->ds_base = 0;
- c->ds_arbytes = c->cs_arbytes;
- c->ds_arbytes.fields.seg_type = 0x3;
-
- c->es_sel = DATA_SELECTOR;
- c->es_limit = 0xFFFFFFFF;
- c->es_base = 0;
- c->es_arbytes = c->ds_arbytes;
-
- c->ss_sel = DATA_SELECTOR;
- c->ss_limit = 0xFFFFFFFF;
- c->ss_base = 0;
- c->ss_arbytes = c->ds_arbytes;
-
- c->fs_sel = DATA_SELECTOR;
- c->fs_limit = 0xFFFFFFFF;
- c->fs_base = 0;
- c->fs_arbytes = c->ds_arbytes;
-
- c->gs_sel = DATA_SELECTOR;
- c->gs_limit = 0xFFFFFFFF;
- c->gs_base = 0;
- c->gs_arbytes = c->ds_arbytes;
-
- c->tr_sel = TSS_SELECTOR;
- c->tr_limit = sizeof(tss) - 1;
- c->tr_base = (unsigned long) &tss;
- c->tr_arbytes.fields.seg_type = 0xb; /* 0x9 | 0x2 (busy) */
- c->tr_arbytes.fields.s = 0;
- c->tr_arbytes.fields.dpl = 0;
- c->tr_arbytes.fields.p = 1;
- c->tr_arbytes.fields.avl = 0;
- c->tr_arbytes.fields.default_ops_size = 0;
- c->tr_arbytes.fields.g = 0;
-
- c->ldtr_sel = 0;
- c->ldtr_limit = 0;
- c->ldtr_base = 0;
- c->ldtr_arbytes = c->ds_arbytes;
- c->ldtr_arbytes.fields.seg_type = 0x2;
- c->ldtr_arbytes.fields.s = 0;
- c->ldtr_arbytes.fields.dpl = 0;
- c->ldtr_arbytes.fields.p = 1;
- c->ldtr_arbytes.fields.avl = 0;
- c->ldtr_arbytes.fields.default_ops_size = 0;
- c->ldtr_arbytes.fields.g = 0;
-}
-
-/*
- * Start BIOS by causing a world switch to vmxassist, which causes
- * VM8086 to be enabled and control is transfered to F000:FFF0.
- */
-void
-start_bios(void)
-{
- if (booting_cpu == 0)
- printf("Start BIOS ...\n");
- else
- printf("Start AP %d from %08x ...\n",
- booting_cpu, booting_vector << 12);
-
- initialize_real_mode = 1;
- set_cr0(get_cr0() & ~CR0_PE);
- panic("vmxassist returned"); /* "cannot happen" */
-}
-
-int
-main(void)
-{
-
- printf("Hello from VMXAssist\n");
-
- if (booting_cpu == 0)
- banner();
-
-#ifdef TEST
- setup_paging();
-#endif
-
- setup_gdt();
- setup_idt();
-
-#ifndef TEST
- set_cr4(get_cr4() | CR4_VME);
-#endif
-
- setup_ctx();
-
- if (booting_cpu == 0)
- setup_pic();
-
- start_bios();
-
- return 0;
-}