430 lines
10 KiB
C
430 lines
10 KiB
C
#include "kernel/kernel.h"
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#include <minix/minlib.h>
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#include <minix/const.h>
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/*
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* == IMPORTANT ==
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* Routines in this file can not use any variable in kernel BSS,
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* since before image is extracted, no BSS is allocated.
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* So pay attention to any external call (including library call).
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*
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* */
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#include <minix/types.h>
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#include <minix/type.h>
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#include <minix/com.h>
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#include <sys/param.h>
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#include <machine/partition.h>
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#include "../../../boot/image.h"
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#include "string.h"
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#include "arch_proto.h"
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#include "libexec.h"
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#include <machine/multiboot.h>
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#if USE_SYSDEBUG
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#define MULTIBOOT_VERBOSE 1
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#endif
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/* FIXME: Share this define with kernel linker script */
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#define MULTIBOOT_KERNEL_ADDR 0x00200000UL
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/* Granularity used in image file and copying */
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#define GRAN 512
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#define SECT_CEIL(x) ((((x) - 1) / GRAN + 1) * GRAN)
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/* String length used for mb_itoa */
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#define ITOA_BUFFER_SIZE 20
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#define mb_load_phymem(buf, phy, len) \
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phys_copy((phy), (u32_t)(buf), (len))
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#define mb_save_phymem(buf, phy, len) \
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phys_copy((u32_t)(buf), (phy), (len))
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FORWARD _PROTOTYPE(void mb_print, (char *str));
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PRIVATE void mb_itoa(u32_t val, char * out)
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{
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char ret[ITOA_BUFFER_SIZE];
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int i = ITOA_BUFFER_SIZE - 2;
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/* Although there's a library version of itoa(int n),
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* we can't use it since that implementation relies on BSS segment
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*/
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ret[ITOA_BUFFER_SIZE - 2] = '0';
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if (val) {
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for (; i >= 0; i--) {
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char c;
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if (val == 0) break;
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c = val % 10;
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val = val / 10;
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c += '0';
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ret[i] = c;
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}
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}
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else
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i--;
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ret[ITOA_BUFFER_SIZE - 1] = 0;
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strcpy(out, ret + i + 1);
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}
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PRIVATE void mb_itox(u32_t val, char *out)
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{
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char ret[9];
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int i = 7;
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/* Convert a number to hex string */
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ret[7] = '0';
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if (val) {
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for (; i >= 0; i--) {
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char c;
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if (val == 0) break;
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c = val & 0xF;
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val = val >> 4;
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if (c > 9)
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c += 'A' - 10;
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else
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c += '0';
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ret[i] = c;
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}
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}
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else
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i--;
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ret[8] = 0;
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strcpy(out, ret + i + 1);
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}
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PRIVATE void mb_put_char(char c, int line, int col)
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{
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/* Write a char to vga display buffer. */
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if (line<MULTIBOOT_CONSOLE_LINES&&col<MULTIBOOT_CONSOLE_COLS)
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mb_save_phymem(
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&c,
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MULTIBOOT_VIDEO_BUFFER
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+ line * MULTIBOOT_CONSOLE_COLS * 2
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+ col * 2,
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1);
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}
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PRIVATE char mb_get_char(int line, int col)
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{
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char c;
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/* Read a char to from display buffer. */
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if (line < MULTIBOOT_CONSOLE_LINES && col < MULTIBOOT_CONSOLE_COLS)
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mb_load_phymem(
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&c,
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MULTIBOOT_VIDEO_BUFFER
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+ line * MULTIBOOT_CONSOLE_COLS * 2
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+ col * 2,
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1);
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return c;
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}
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/* Give non-zero values to avoid them in BSS */
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PRIVATE int print_line = 1, print_col = 1;
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PRIVATE void mb_cls(void)
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{
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#if MULTIBOOT_VERBOSE
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int i, j;
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/* Clear screen */
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for (i = 0; i < MULTIBOOT_CONSOLE_LINES; i++ )
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for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ )
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mb_put_char(0, i, j);
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print_line = print_col = 0;
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#endif
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}
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PRIVATE void mb_scroll_up(int lines)
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{
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int i, j;
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for (i = 0; i < MULTIBOOT_CONSOLE_LINES - lines; i++ ) {
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for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ )
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mb_put_char(mb_get_char(i + lines, j), i, j);
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}
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print_line-= lines;
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}
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PRIVATE void mb_print(char *str)
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{
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#if MULTIBOOT_VERBOSE
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while (*str) {
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if (*str == '\n') {
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str++;
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print_line++;
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print_col = 0;
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continue;
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}
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mb_put_char(*str++, print_line, print_col++);
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if (print_col >= MULTIBOOT_CONSOLE_COLS) {
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print_line++;
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print_col = 0;
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}
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while (print_line >= MULTIBOOT_CONSOLE_LINES)
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mb_scroll_up(1);
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}
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#endif /* MULTIBOOT_VERBOSE */
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}
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PRIVATE void mb_print_hex(u32_t value)
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{
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int i;
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char c;
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char out[9] = "00000000";
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/* Print a hex value */
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for (i = 7; i >= 0; i--) {
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c = value % 0x10;
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value /= 0x10;
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if (c < 10)
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c += '0';
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else
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c += 'A'-10;
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out[i] = c;
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}
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mb_print(out);
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}
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PRIVATE int mb_set_param(char *name, char *value)
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{
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char *p = multiboot_param_buf;
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char *q;
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int namelen = strlen(name);
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int valuelen = strlen(value);
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/* Delete the item if already exists */
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while (*p) {
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if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') {
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q = p;
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while (*q) q++;
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for (q++;
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q < multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE;
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q++, p++)
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*p = *q;
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break;
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}
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while (*p++)
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;
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p++;
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}
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for (p = multiboot_param_buf;
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p < multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE
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&& (*p || *(p + 1));
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p++)
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;
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if (p > multiboot_param_buf) p++;
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/* Make sure there's enough space for the new parameter */
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if (p + namelen + valuelen + 3
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> multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE)
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return -1;
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strcpy(p, name);
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p[namelen] = '=';
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strcpy(p + namelen + 1, value);
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p[namelen + valuelen + 1] = 0;
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p[namelen + valuelen + 2] = 0;
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return 0;
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}
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PRIVATE void get_parameters(multiboot_info_t *mbi)
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{
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char mem_value[40], temp[ITOA_BUFFER_SIZE];
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int i;
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int dev;
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int ctrlr;
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int disk, prim, sub;
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int var_i,value_i;
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char *p;
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const static int dev_cNd0[] = { 0x0300, 0x0800, 0x0A00, 0x0C00, 0x1000 };
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static char mb_cmd_buff[GRAN] = "add some value to avoid me in BSS";
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static char var[GRAN] = "add some value to avoid me in BSS";
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static char value[GRAN] = "add some value to avoid me in BSS";
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for (i = 0; i < MULTIBOOT_PARAM_BUF_SIZE; i++)
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multiboot_param_buf[i] = 0;
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if (mbi->flags & MULTIBOOT_INFO_BOOTDEV) {
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disk = ((mbi->boot_device&0xff000000) >> 24)-0x80;
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prim = (mbi->boot_device & 0xff0000) >> 16;
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if (prim == 0xff)
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prim = 0;
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sub = (mbi->boot_device & 0xff00) >> 8;
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if (sub == 0xff)
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sub = 0;
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ctrlr = 0;
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dev = dev_cNd0[ctrlr];
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/* Determine the value of rootdev */
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dev += 0x80
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+ (disk * NR_PARTITIONS + prim) * NR_PARTITIONS + sub;
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mb_itoa(dev, temp);
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mb_set_param("rootdev", temp);
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mb_set_param("ramimagedev", temp);
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}
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mb_set_param("hz", "60");
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if (mbi->flags & MULTIBOOT_INFO_MEMORY)
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{
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strcpy(mem_value, "800:");
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mb_itox(
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mbi->mem_lower * 1024 > MULTIBOOT_LOWER_MEM_MAX ?
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MULTIBOOT_LOWER_MEM_MAX : mbi->mem_lower * 1024,
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temp);
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strcat(mem_value, temp);
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strcat(mem_value, ",100000:");
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mb_itox(mbi->mem_upper * 1024, temp);
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strcat(mem_value, temp);
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mb_set_param("memory", mem_value);
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}
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if (mbi->flags&MULTIBOOT_INFO_CMDLINE) {
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/* Override values with cmdline argument */
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p = mb_cmd_buff;
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mb_load_phymem(mb_cmd_buff, mbi->cmdline, GRAN);
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while (*p) {
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var_i = 0;
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value_i = 0;
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while (*p == ' ') p++;
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if (!*p) break;
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while (*p && *p != '=' && var_i < GRAN - 1)
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var[var_i++] = *p++ ;
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var[var_i] = 0;
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p++; /* skip '=' */
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while (*p && *p != ' ' && value_i < GRAN - 1)
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value[value_i++] = *p++ ;
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value[value_i] = 0;
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mb_set_param(var, value);
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}
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}
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}
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PRIVATE int mb_clear_memrange(phys_bytes start, phys_bytes end)
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{
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int empty = 0;
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int i;
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/* FIXME: use faster function */
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for (i = start; i < end; i++)
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phys_copy((phys_bytes)&empty, i, 1);
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return 0;
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}
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PRIVATE void mb_extract_image(multiboot_info_t mbi)
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{
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multiboot_module_t *mb_module_info;
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multiboot_module_t *module;
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u32_t mods_count = mbi.mods_count;
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int r, i;
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vir_bytes text_vaddr, text_filebytes, text_membytes;
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vir_bytes data_vaddr, data_filebytes, data_membytes;
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phys_bytes text_paddr, data_paddr;
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vir_bytes stack_bytes;
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vir_bytes pc;
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off_t text_offset, data_offset;
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/* Save memory map for kernel tasks */
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r = read_header_elf((const char *)MULTIBOOT_KERNEL_ADDR,
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&text_vaddr, &text_paddr,
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&text_filebytes, &text_membytes,
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&data_vaddr, &data_paddr,
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&data_filebytes, &data_membytes,
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&pc, &text_offset, &data_offset);
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for (i = 0; i < NR_TASKS; ++i) {
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image[i].memmap.text_vaddr = trunc_page(text_vaddr);
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image[i].memmap.text_paddr = trunc_page(text_paddr);
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image[i].memmap.text_bytes = text_membytes;
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image[i].memmap.data_vaddr = trunc_page(data_vaddr);
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image[i].memmap.data_paddr = trunc_page(data_paddr);
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image[i].memmap.data_bytes = data_membytes;
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image[i].memmap.stack_bytes = 0;
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image[i].memmap.entry = pc;
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}
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#ifdef MULTIBOOT_VERBOSE
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mb_print("\nKernel: ");
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mb_print_hex(trunc_page(text_paddr));
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mb_print("-");
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mb_print_hex(trunc_page(data_paddr) + data_membytes);
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mb_print(" Entry: ");
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mb_print_hex(pc);
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#endif
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mb_module_info = ((multiboot_module_t *)mbi.mods_addr);
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module = &mb_module_info[0];
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/* Load boot image services into memory and save memory map */
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for (i = 0; module < &mb_module_info[mods_count]; ++module, ++i) {
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r = read_header_elf((const char *)module->mod_start,
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&text_vaddr, &text_paddr,
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&text_filebytes, &text_membytes,
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&data_vaddr, &data_paddr,
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&data_filebytes, &data_membytes,
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&pc, &text_offset, &data_offset);
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if (r) {
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mb_print("fatal: ELF parse failure\n");
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/* Spin here */
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while (1)
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;
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}
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stack_bytes = round_page(image[NR_TASKS+i].stack_kbytes * 1024);
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/* Load text segment */
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phys_copy(module->mod_start+text_offset, text_paddr,
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text_filebytes);
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mb_clear_memrange(text_paddr+text_filebytes,
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trunc_page(text_paddr) + text_membytes);
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/* Load data and stack segments */
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phys_copy(module->mod_start+data_offset, data_paddr,
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data_filebytes);
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mb_clear_memrange(data_paddr+data_filebytes,
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trunc_page(data_paddr) + data_membytes
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+ stack_bytes);
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/* Save memmap for non-kernel tasks, so subscript past kernel
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tasks. */
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image[NR_TASKS+i].memmap.text_vaddr = trunc_page(text_vaddr);
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image[NR_TASKS+i].memmap.text_paddr = trunc_page(text_paddr);
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image[NR_TASKS+i].memmap.text_bytes = text_membytes;
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image[NR_TASKS+i].memmap.data_vaddr = trunc_page(data_vaddr);
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image[NR_TASKS+i].memmap.data_paddr = trunc_page(data_paddr);
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image[NR_TASKS+i].memmap.data_bytes = data_membytes;
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image[NR_TASKS+i].memmap.stack_bytes = stack_bytes;
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image[NR_TASKS+i].memmap.entry = pc;
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#ifdef MULTIBOOT_VERBOSE
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mb_print("\n");
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mb_print_hex(i);
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mb_print(": ");
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mb_print_hex(trunc_page(text_paddr));
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mb_print("-");
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mb_print_hex(trunc_page(data_paddr) + data_membytes + stack_bytes);
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mb_print(" Entry: ");
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mb_print_hex(pc);
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mb_print(" Stack: ");
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mb_print_hex(stack_bytes);
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mb_print(" ");
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mb_print((char *)module->cmdline);
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#endif
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}
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return;
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}
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PUBLIC phys_bytes pre_init(u32_t ebx)
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{
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multiboot_info_t mbi;
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/* Do pre-initialization for multiboot, returning physical address of
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* of multiboot module info
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*/
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mb_cls();
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mb_print("\nMINIX booting... ");
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mb_load_phymem(&mbi, ebx, sizeof(mbi));
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get_parameters(&mbi);
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mb_print("\nLoading image... ");
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mb_extract_image(mbi);
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return mbi.mods_addr;
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}
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