327 lines
9.4 KiB
C
327 lines
9.4 KiB
C
/*-
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* Copyright (c) 2018 Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "vmmapi.h"
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#include "sw_load.h"
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#define SETUP_SIG 0x5a5aaa55
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/* If we load kernel/ramdisk/bootargs directly, the UOS
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* memory layout will be like:
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*
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* | ... |
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* +-----------------------------------------------------+
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* | offset: 0xf2400 (ACPI table) |
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* +-----------------------------------------------------+
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* | ... |
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* +-----------------------------------------------------+
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* | offset: 16MB (kernel image) |
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* +-----------------------------------------------------+
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* | ... |
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* +-----------------------------------------------------+
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* | offset: lowmem - 4MB (ramdisk image) |
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* +-----------------------------------------------------+
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* | offset: lowmem - 8K (bootargs) |
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* +-----------------------------------------------------+
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* | offset: lowmem - 6K (kernel entry address) |
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* +-----------------------------------------------------+
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* | offset: lowmem - 4K (zero_page include e820 table) |
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* +-----------------------------------------------------+
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*/
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/* Check default e820 table in sw_load_common.c for info about ctx->lowmem */
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#define RAMDISK_LOAD_OFF(ctx) (ctx->lowmem - 4*MB)
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#define BOOTARGS_LOAD_OFF(ctx) (ctx->lowmem - 8*KB)
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#define KERNEL_ENTRY_OFF(ctx) (ctx->lowmem - 6*KB)
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#define ZEROPAGE_LOAD_OFF(ctx) (ctx->lowmem - 4*KB)
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#define KERNEL_LOAD_OFF(ctx) (16*MB)
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/* The real mode kernel header, refer to Documentation/x86/boot.txt */
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struct _zeropage {
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uint8_t pad1[0x1e8]; /* 0x000 */
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uint8_t e820_nentries; /* 0x1e8 */
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uint8_t pad2[0x8]; /* 0x1e9 */
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struct {
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uint8_t hdr_pad1[0x1f]; /* 0x1f1 */
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uint8_t loader_type; /* 0x210 */
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uint8_t load_flags; /* 0x211 */
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uint8_t hdr_pad2[0x2]; /* 0x212 */
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uint32_t code32_start; /* 0x214 */
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uint32_t ramdisk_addr; /* 0x218 */
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uint32_t ramdisk_size; /* 0x21c */
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uint8_t hdr_pad3[0x8]; /* 0x220 */
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uint32_t bootargs_addr; /* 0x228 */
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uint8_t hdr_pad4[0x3c]; /* 0x22c */
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} __attribute__((packed)) hdr;
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uint8_t pad3[0x68]; /* 0x268 */
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struct e820_entry e820[0x80]; /* 0x2d0 */
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uint8_t pad4[0x330]; /* 0xcd0 */
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} __attribute__((packed));
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static char ramdisk_path[STR_LEN];
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static char kernel_path[STR_LEN];
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static int with_ramdisk;
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static int with_kernel;
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static int ramdisk_size;
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static int kernel_size;
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static int
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acrn_get_bzimage_setup_size(struct vmctx *ctx)
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{
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uint32_t *tmp, location = 1024, setup_sectors;
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int size = -1;
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tmp = (uint32_t *)(ctx->baseaddr + KERNEL_LOAD_OFF(ctx)) + 1024/4;
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while (*tmp != SETUP_SIG && location < 0x8000) {
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tmp++;
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location += 4;
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}
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/* setup size must be at least 1024 bytes and small than 0x8000 */
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if (location < 0x8000 && location > 1024) {
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setup_sectors = (location + 511) / 512;
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size = setup_sectors*512;
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printf("SW_LOAD: found setup sig @ 0x%08x, "
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"setup_size is 0x%08x\n",
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location, size);
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} else
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printf("SW_LOAD ERR: could not get setup "
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"size in kernel %s\n",
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kernel_path);
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return size;
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}
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int
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acrn_parse_kernel(char *arg)
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{
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size_t len = strlen(arg);
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if (len < STR_LEN) {
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strncpy(kernel_path, arg, len + 1);
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if (check_image(kernel_path) != 0){
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fprintf(stderr, "SW_LOAD: check_image failed for '%s'\n",
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kernel_path);
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exit(10); /* Non-zero */
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}
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with_kernel = 1;
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printf("SW_LOAD: get kernel path %s\n", kernel_path);
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return 0;
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} else
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return -1;
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}
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int
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acrn_parse_ramdisk(char *arg)
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{
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size_t len = strlen(arg);
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if (len < STR_LEN) {
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strncpy(ramdisk_path, arg, len + 1);
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if (check_image(ramdisk_path) != 0){
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fprintf(stderr, "SW_LOAD: check_image failed for '%s'\n",
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ramdisk_path);
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exit(11); /* Non-zero */
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}
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with_ramdisk = 1;
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printf("SW_LOAD: get ramdisk path %s\n", ramdisk_path);
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return 0;
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} else
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return -1;
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}
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static int
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acrn_prepare_ramdisk(struct vmctx *ctx)
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{
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FILE *fp;
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int len, read;
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fp = fopen(ramdisk_path, "r");
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if (fp == NULL) {
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printf("SW_LOAD ERR: could not open ramdisk file %s\n",
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ramdisk_path);
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return -1;
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}
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fseek(fp, 0, SEEK_END);
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len = ftell(fp);
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if (len > (BOOTARGS_LOAD_OFF(ctx) - RAMDISK_LOAD_OFF(ctx))) {
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printf("SW_LOAD ERR: the size of ramdisk file is too big"
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" file len=0x%x, limit is 0x%lx\n", len,
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BOOTARGS_LOAD_OFF(ctx) - RAMDISK_LOAD_OFF(ctx));
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fclose(fp);
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return -1;
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}
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ramdisk_size = len;
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fseek(fp, 0, SEEK_SET);
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read = fread(ctx->baseaddr + RAMDISK_LOAD_OFF(ctx),
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sizeof(char), len, fp);
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if (read < len) {
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printf("SW_LOAD ERR: could not read the whole ramdisk file,"
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" file len=%d, read %d\n", len, read);
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fclose(fp);
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return -1;
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}
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fclose(fp);
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printf("SW_LOAD: ramdisk %s size %d copied to guest 0x%lx\n",
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ramdisk_path, ramdisk_size, RAMDISK_LOAD_OFF(ctx));
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return 0;
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}
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static int
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acrn_prepare_kernel(struct vmctx *ctx)
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{
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FILE *fp;
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int len, read;
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fp = fopen(kernel_path, "r");
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if (fp == NULL) {
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printf("SW_LOAD ERR: could not open kernel file %s\n",
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kernel_path);
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return -1;
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}
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fseek(fp, 0, SEEK_END);
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len = ftell(fp);
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if ((len + KERNEL_LOAD_OFF(ctx)) > RAMDISK_LOAD_OFF(ctx)) {
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printf("SW_LOAD ERR: need big system memory to fit image\n");
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fclose(fp);
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return -1;
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}
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kernel_size = len;
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fseek(fp, 0, SEEK_SET);
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read = fread(ctx->baseaddr + KERNEL_LOAD_OFF(ctx),
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sizeof(char), len, fp);
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if (read < len) {
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printf("SW_LOAD ERR: could not read the whole kernel file,"
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" file len=%d, read %d\n", len, read);
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fclose(fp);
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return -1;
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}
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fclose(fp);
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printf("SW_LOAD: kernel %s size %d copied to guest 0x%lx\n",
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kernel_path, kernel_size, KERNEL_LOAD_OFF(ctx));
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return 0;
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}
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static int
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acrn_prepare_zeropage(struct vmctx *ctx, int setup_size)
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{
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struct _zeropage *zeropage = (struct _zeropage *)
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(ctx->baseaddr + ZEROPAGE_LOAD_OFF(ctx));
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struct _zeropage *kernel_load = (struct _zeropage *)
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(ctx->baseaddr + KERNEL_LOAD_OFF(ctx));
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/* clear the zeropage */
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memset(zeropage, 0, 2*KB);
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/* copy part of the header into the zero page */
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memcpy(&(zeropage->hdr), &(kernel_load->hdr), sizeof(zeropage->hdr));
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if (with_ramdisk) {
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/*Copy ramdisk load_addr and size in zeropage header structure*/
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zeropage->hdr.ramdisk_addr = (uint32_t)
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((uint64_t)RAMDISK_LOAD_OFF(ctx));
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zeropage->hdr.ramdisk_size = (uint32_t)ramdisk_size;
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printf("SW_LOAD: build zeropage for ramdisk addr: 0x%x,"
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" size: %d\n", zeropage->hdr.ramdisk_addr,
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zeropage->hdr.ramdisk_size);
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}
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/* Copy bootargs load_addr in zeropage header structure */
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zeropage->hdr.bootargs_addr = (uint32_t)
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((uint64_t)BOOTARGS_LOAD_OFF(ctx));
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printf("SW_LOAD: build zeropage for bootargs addr: 0x%x\n",
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zeropage->hdr.bootargs_addr);
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/* set constant arguments in zero page */
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zeropage->hdr.loader_type = 0xff;
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zeropage->hdr.load_flags |= (1<<5); /* quiet */
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/* Create/add e820 table entries in zeropage */
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zeropage->e820_nentries = acrn_create_e820_table(ctx, zeropage->e820);
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return 0;
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}
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int
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acrn_sw_load_bzimage(struct vmctx *ctx)
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{
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int ret, setup_size;
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uint64_t *cfg_offset = (uint64_t *)(ctx->baseaddr + GUEST_CFG_OFFSET);
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*cfg_offset = ctx->lowmem;
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if (with_bootargs) {
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strcpy(ctx->baseaddr + BOOTARGS_LOAD_OFF(ctx), get_bootargs());
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printf("SW_LOAD: bootargs copied to guest 0x%lx\n",
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BOOTARGS_LOAD_OFF(ctx));
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}
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if (with_ramdisk) {
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ret = acrn_prepare_ramdisk(ctx);
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if (ret)
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return ret;
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}
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if (with_kernel) {
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uint64_t *kernel_entry_addr =
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(uint64_t *)(ctx->baseaddr + KERNEL_ENTRY_OFF(ctx));
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ret = acrn_prepare_kernel(ctx);
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if (ret)
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return ret;
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setup_size = acrn_get_bzimage_setup_size(ctx);
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if (setup_size <= 0)
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return -1;
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*kernel_entry_addr = (uint64_t)
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(KERNEL_LOAD_OFF(ctx) + setup_size);
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ret = acrn_prepare_zeropage(ctx, setup_size);
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if (ret)
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return ret;
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printf("SW_LOAD: zeropage prepared @ 0x%lx, "
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"kernel_entry_addr=0x%lx\n",
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ZEROPAGE_LOAD_OFF(ctx), *kernel_entry_addr);
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}
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return 0;
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}
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