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authorSteffen Winterfeldt <snwint@suse.de>2009-11-26 21:00:17 +0100
committerSebastian Herbszt <herbszt@gmx.de>2009-11-26 21:00:17 +0100
commitaae5483d9ebd6f091aa740108ad7f2958303931f (patch)
tree48e101a5e98188c3610ee59384a1f0e9a28f8b0b /com32/gfxboot
parent9269d2e170966ff455ea6141da13f9c5c5d484df (diff)
downloadsyslinux-aae5483d9ebd6f091aa740108ad7f2958303931f.tar.gz
syslinux-aae5483d9ebd6f091aa740108ad7f2958303931f.tar.xz
syslinux-aae5483d9ebd6f091aa740108ad7f2958303931f.zip
Ok, here is the first try to turn the gfxboot wrapper into a com32 module. I had to extend the interface to the gfxboot core a bit to get it working. So it works only with latest gfxboot from git://gitorious.org/gfxboot/gfxboot.git Steffen Signed-off-by: Sebastian Herbszt <herbszt@gmx.de>
Diffstat (limited to 'com32/gfxboot')
-rw-r--r--com32/gfxboot/Makefile44
-rw-r--r--com32/gfxboot/gfxboot.c806
-rw-r--r--com32/gfxboot/realmode_callback.asm190
3 files changed, 1040 insertions, 0 deletions
diff --git a/com32/gfxboot/Makefile b/com32/gfxboot/Makefile
new file mode 100644
index 00000000..2affcdea
--- /dev/null
+++ b/com32/gfxboot/Makefile
@@ -0,0 +1,44 @@
+## -----------------------------------------------------------------------
+##
+## Copyright 2001-2009 H. Peter Anvin - All Rights Reserved
+## Copyright 2009 Intel Corporation; author: H. Peter Anvin
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+## Boston MA 02111-1307, USA; either version 2 of the License, or
+## (at your option) any later version; incorporated herein by reference.
+##
+## -----------------------------------------------------------------------
+
+topdir = ../..
+include ../MCONFIG
+
+MODULES = gfxboot.c32
+
+all: $(MODULES)
+
+gfxboot.elf : gfxboot.o realmode_callback.o $(LIBS) $(C_LIBS)
+ $(LD) $(LDFLAGS) -o $@ $^
+
+realmode_callback.o: realmode_callback.asm
+ nasm -f bin -O99 -o $*.tmp -l $*.lst $<
+ objcopy -B i386 -I binary -O elf32-i386 \
+ --redefine-sym _binary_$*_tmp_start=$*_start \
+ --redefine-sym _binary_$*_tmp_end=$*_end \
+ --strip-symbol _binary_$*_tmp_size \
+ $*.tmp $@
+
+tidy dist:
+ rm -f *.o *.lo *.a *.lst *.elf .*.d *.tmp
+
+clean: tidy
+ rm -f *.lnx
+
+spotless: clean
+ rm -f *.lss *.c32 *.com
+ rm -f *~ \#*
+
+install:
+
+-include .*.d
diff --git a/com32/gfxboot/gfxboot.c b/com32/gfxboot/gfxboot.c
new file mode 100644
index 00000000..e1b865a1
--- /dev/null
+++ b/com32/gfxboot/gfxboot.c
@@ -0,0 +1,806 @@
+/*
+ *
+ * gfxboot.c
+ *
+ * A com32 module to load gfxboot graphics.
+ *
+ * Copyright (c) 2009 Steffen Winterfeldt.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, Inc., 53 Temple Place Ste 330, Boston MA
+ * 02111-1307, USA; either version 2 of the License, or (at your option) any
+ * later version; incorporated herein by reference.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <syslinux/loadfile.h>
+#include <syslinux/config.h>
+#include <syslinux/linux.h>
+#include <syslinux/boot.h>
+#include <console.h>
+#include <com32.h>
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+#define MAX_CONFIG_LINE_LEN 2048
+#define MAX_CMDLINE_LEN 2048
+
+// buffer for realmode callback
+// must be at least block size; can in theory be larger than 4k, but there's
+// not enough space left
+#define REALMODE_BUF_SIZE 4096
+
+// gfxboot working memory in MB
+#define GFX_MEMORY_SIZE 7
+
+// read chunk size for progress bar
+#define CHUNK_SIZE (64 << 10)
+
+// callback function numbers
+#define GFX_CB_INIT 0
+#define GFX_CB_DONE 1
+#define GFX_CB_INPUT 2
+#define GFX_CB_MENU_INIT 3
+#define GFX_CB_INFOBOX_INIT 4
+#define GFX_CB_INFOBOX_DONE 5
+#define GFX_CB_PROGRESS_INIT 6
+#define GFX_CB_PROGRESS_DONE 7
+#define GFX_CB_PROGRESS_UPDATE 8
+#define GFX_CB_PROGRESS_LIMIT 9 // unused
+#define GFX_CB_PASSWORD_INIT 10
+#define GFX_CB_PASSWORD_DONE 11
+
+// real mode code chunk, will be placed into bounce buffer
+extern void realmode_callback_start, realmode_callback_end;
+
+// gets in the way
+#undef linux
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// gfxboot config data (64 bytes)
+typedef struct __attribute__ ((packed)) {
+ uint8_t bootloader; // 0: boot loader type (0: lilo, 1: syslinux, 2: grub)
+ uint8_t sector_shift; // 1: sector shift
+ uint8_t media_type; // 2: media type (0: disk, 1: floppy, 2: cdrom)
+ uint8_t failsafe; // 3: turn on failsafe mode (bitmask)
+ // 0: SHIFT pressed
+ // 1: skip gfxboot
+ // 2: skip monitor detection
+ uint8_t sysconfig_size; // 4: size of sysconfig data
+ uint8_t boot_drive; // 5: BIOS boot drive
+ uint16_t callback; // 6: offset to callback handler
+ uint16_t bootloader_seg; // 8: code/data segment used by bootloader; must follow gfx_callback
+ uint16_t serial_port; // 10: syslinux initialized serial port from 'serial' option
+ uint32_t user_info_0; // 12: data for info box
+ uint32_t user_info_1; // 16: data for info box
+ uint32_t bios_mem_size; // 20: BIOS memory size (in bytes)
+ uint16_t xmem_0; // 24: extended mem area 0 (start:size in MB; 12:4 bits) - obsolete
+ uint16_t xmem_1; // 26: extended mem area 1 - obsolete
+ uint16_t xmem_2; // 28: extended mem area 2 - obsolete
+ uint16_t xmem_3; // 30: extended mem area 3 - obsolete
+ uint32_t file; // 32: start of gfx file
+ uint32_t archive_start; // 36: start of cpio archive
+ uint32_t archive_end; // 40: end of cpio archive
+ uint32_t mem0_start; // 44: low free memory start
+ uint32_t mem0_end; // 48: low free memory end
+ uint32_t xmem_start; // 52: extended mem start
+ uint32_t xmem_end; // 56: extended mem end
+ uint16_t features; // 60: feature flags returned by GFX_CB_INIT
+ // 0: GFX_CB_MENU_INIT accepts 32 bit addresses
+ // 1: knows about xmem_start, xmem_end
+ uint16_t reserved_1; // 62:
+} gfx_config_t;
+
+
+// gfxboot menu description (18 bytes)
+typedef struct __attribute__ ((packed)) {
+ uint16_t entries;
+ char *default_entry;
+ char *label_list;
+ uint16_t label_size;
+ char *arg_list;
+ uint16_t arg_size;
+} gfx_menu_t;
+
+
+// menu description
+typedef struct menu_s {
+ struct menu_s *next;
+ char *label;
+ char *kernel;
+ char *linux;
+ char *localboot;
+ char *initrd;
+ char *append;
+ char *ipappend;
+} menu_t;
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+gfx_config_t gfx_config;
+gfx_menu_t gfx_menu;
+
+menu_t *menu;
+menu_t *menu_default;
+
+struct {
+ uint32_t jmp_table[12];
+ uint16_t code_seg;
+ char fname_buf[64];
+} gfx;
+
+void *lowmem_buf;
+unsigned lowmem_buf_size;
+
+int timeout;
+
+char cmdline[MAX_CMDLINE_LEN];
+
+void *save_buf;
+unsigned save_buf_size;
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void show_message(char *file);
+char *get_config_file_name(void);
+char *skip_spaces(char *s);
+char *skip_nonspaces(char *s);
+void chop_line(char *s);
+int read_config_file(void);
+unsigned magic_ok(unsigned char *buf, unsigned *code_size);
+unsigned find_file(unsigned char *buf, unsigned len, unsigned *gfx_file_start, unsigned *file_len, unsigned *code_size);
+int gfx_init(char *file);
+int gfx_menu_init(void);
+void gfx_done(void);
+int gfx_input(void);
+ssize_t save_read(int fd, void *buf, size_t size);
+void *load_one(char *file, ssize_t *file_size);
+void boot(void);
+void boot_entry(menu_t *menu_ptr, char *arg);
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+int main(int argc, char **argv)
+{
+ int menu_index;
+ enum syslinux_filesystem syslinux_id;
+ com32sys_t r;
+
+ openconsole(&dev_stdcon_r, &dev_stdcon_w);
+
+ syslinux_id = syslinux_version()->filesystem;
+
+ lowmem_buf = __com32.cs_bounce;
+ lowmem_buf_size = __com32.cs_bounce_size;
+
+ r.eax.l = 0x0a; // Get Derivative-Specific Information
+ r.ecx.l = 9;
+ __intcall(0x22, &r, &r);
+ gfx_config.sector_shift = (uint8_t) r.ecx.l;
+ gfx_config.boot_drive = (uint8_t) r.edx.l;
+
+ if(syslinux_id == SYSLINUX_FS_PXELINUX) {
+ gfx_config.sector_shift = 11;
+ gfx_config.boot_drive = 0;
+ }
+
+ gfx_config.bootloader = 1;
+ gfx_config.sysconfig_size = sizeof gfx_config;
+ gfx_config.bootloader_seg = 0; // apparently not needed
+
+ save_buf_size = lowmem_buf_size;
+ save_buf = malloc(save_buf_size);
+
+ if(argc < 2) {
+ printf("Usage: gfxboot.c32 bootlogo_file [message_file]\n");
+ if(argc > 2) show_message(argv[2]);
+
+ return 0;
+ }
+
+ if(read_config_file()) {
+ printf("Error reading config file\n");
+ if(argc > 2) show_message(argv[2]);
+
+ return 0;
+ }
+
+ if(gfx_init(argv[1])) {
+ printf("Error setting up gfxboot\n");
+ if(argc > 2) show_message(argv[2]);
+
+ return 0;
+ }
+
+ gfx_menu_init();
+
+ for(;;) {
+ menu_index = gfx_input();
+
+ // abort gfx, return to text mode prompt
+ if(menu_index == -1) {
+ gfx_done();
+ break;
+ }
+
+ // does not return if it succeeds
+ boot();
+ }
+
+ if(argc > 2) show_message(argv[2]);
+
+ return 0;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void show_message(char *file)
+{
+ int c;
+ FILE *f;
+
+ if(!(f = fopen(file, "r"))) return;
+
+ while((c = getc(f)) != EOF) {
+ if(c < ' ' && c != '\n' && c != '\t') continue;
+ printf("%c", c);
+ }
+
+ fclose(f);
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+char *skip_spaces(char *s)
+{
+ while(*s && (*s == ' ' || *s == '\t')) s++;
+
+ return s;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+char *skip_nonspaces(char *s)
+{
+ while(*s && *s != ' ' && *s != '\t') s++;
+
+ return s;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void chop_line(char *s)
+{
+ int i = strlen(s);
+
+ if(!i) return;
+
+ while(--i >= 0) {
+ if(s[i] == ' ' || s[i] == '\t' || s[i] == '\n') {
+ s[i] = 0;
+ }
+ else {
+ break;
+ }
+ }
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Read and parse syslinux config file.
+//
+// return:
+// 0: ok, 1: error
+//
+int read_config_file(void)
+{
+ FILE *f;
+ char *s, *t, buf[MAX_CONFIG_LINE_LEN];
+ unsigned u, menu_idx = 0, label_size = 0, append_size = 0;
+ menu_t *menu_ptr = NULL, **menu_next = &menu;
+
+ menu_default = calloc(1, sizeof *menu_default);
+
+ if(!(f = fopen(syslinux_config_file(), "r"))) return 1;
+
+ while((s = fgets(buf, sizeof buf, f))) {
+ chop_line(s);
+ s = skip_spaces(s);
+ if(!*s || *s == '#') continue;
+ t = skip_nonspaces(s);
+ if(*t) *t++ = 0;
+ t = skip_spaces(t);
+
+ if(!strcmp(s, "timeout")) {
+ timeout = atoi(t);
+ continue;
+ }
+
+ if(!strcmp(s, "default")) {
+ menu_default->label = strdup(t);
+ u = strlen(t);
+ if(u > label_size) label_size = u;
+ continue;
+ }
+
+ if(!strcmp(s, "label")) {
+ menu_ptr = *menu_next = calloc(1, sizeof **menu_next);
+ menu_next = &menu_ptr->next;
+ menu_idx++;
+ menu_ptr->label = strdup(t);
+ u = strlen(t);
+ if(u > label_size) label_size = u;
+ continue;
+ }
+
+ if(!strcmp(s, "kernel") && menu_ptr) {
+ menu_ptr->kernel = strdup(t);
+ continue;
+ }
+
+ if(!strcmp(s, "linux") && menu_ptr) {
+ menu_ptr->linux = strdup(t);
+ continue;
+ }
+
+ if(!strcmp(s, "localboot") && menu_ptr) {
+ menu_ptr->localboot = strdup(t);
+ continue;
+ }
+
+ if(!strcmp(s, "initrd") && menu_ptr) {
+ menu_ptr->initrd = strdup(t);
+ continue;
+ }
+
+ if(!strcmp(s, "append")) {
+ (menu_ptr ?: menu_default)->append = strdup(t);
+ u = strlen(t);
+ if(u > append_size) append_size = u;
+ continue;
+ }
+
+ if(!strcmp(s, "ipappend")) {
+ (menu_ptr ?: menu_default)->ipappend = strdup(t);
+ continue;
+ }
+ }
+
+ fclose(f);
+
+ // final '\0'
+ label_size++;
+ append_size++;
+
+ gfx_menu.entries = menu_idx;
+ gfx_menu.label_size = label_size;
+ gfx_menu.arg_size = append_size;
+
+ gfx_menu.default_entry = menu_default->label;
+ if(!gfx_menu.default_entry && menu) {
+ gfx_menu.default_entry = menu->label;
+ }
+
+ gfx_menu.label_list = calloc(menu_idx, label_size);
+ gfx_menu.arg_list = calloc(menu_idx, append_size);
+
+ for(u = 0, menu_ptr = menu; menu_ptr; menu_ptr = menu_ptr->next, u++) {
+ if(!menu_ptr->append) menu_ptr->append = menu_default->append;
+ if(!menu_ptr->ipappend) menu_ptr->ipappend = menu_default->ipappend;
+
+ if(menu_ptr->label) strcpy(gfx_menu.label_list + u * label_size, menu_ptr->label);
+ if(menu_ptr->append) strcpy(gfx_menu.arg_list + u * append_size, menu_ptr->append);
+ }
+
+ return 0;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Check header and return code start offset.
+//
+unsigned magic_ok(unsigned char *buf, unsigned *code_size)
+{
+ if(
+ *(unsigned *) buf == 0x0b2d97f00 && // magic id
+ (buf[4] == 8) // version 8
+ ) {
+ *code_size = *(unsigned *) (buf + 12);
+ return *(unsigned *) (buf + 8);
+ }
+
+ return 0;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Search cpio archive for gfx file.
+//
+unsigned find_file(unsigned char *buf, unsigned len, unsigned *gfx_file_start, unsigned *file_len, unsigned *code_size)
+{
+ unsigned i, fname_len, code_start = 0;
+
+ *gfx_file_start = 0;
+ *code_size = 0;
+
+ for(i = 0; i < len;) {
+ if((len - i) >= 0x1a && (buf[i] + (buf[i + 1] << 8)) == 0x71c7) {
+ fname_len = *(unsigned short *) (buf + i + 20);
+ *file_len = *(unsigned short *) (buf + i + 24) + (*(unsigned short *) (buf + i + 22) << 16);
+ i += 26 + fname_len;
+ i = ((i + 1) & ~1);
+ if((code_start = magic_ok(buf + i, code_size))) {
+ *gfx_file_start = i;
+ return code_start;
+ }
+ i += *file_len;
+ i = ((i + 1) & ~1);
+ }
+ else {
+ break;
+ }
+ }
+
+ return code_start;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Initialize gfxboot code.
+//
+// return:
+// 0: ok, 1: error
+//
+int gfx_init(char *file)
+{
+ size_t archive_size = 0;
+ void *archive;
+ unsigned code_start, code_size, file_start, file_len, u;
+ com32sys_t r;
+ void *lowmem = lowmem_buf;
+ unsigned lowmem_size = lowmem_buf_size;
+
+ printf("Loading %s...\n", file);
+ if(loadfile(file, &archive, &archive_size)) return 1;
+
+ if(!archive_size) return 1;
+
+ // printf("%s: %d\n", file, archive_size);
+
+ gfx_config.archive_start = (uint32_t) archive;
+ gfx_config.archive_end = gfx_config.archive_start + archive_size;
+
+ // locate file inside cpio archive
+ if(!(code_start = find_file(archive, archive_size, &file_start, &file_len, &code_size))) {
+ printf("%s: invalid file format\n", file);
+ return 1;
+ }
+
+#if 0
+ printf(
+ "code_start = 0x%x, code_size = 0x%x\n"
+ "archive_start = 0x%x, archive size = 0x%x\n"
+ "file_start = 0x%x, file_len = 0x%x\n",
+ code_start, code_size,
+ gfx_config.archive_start, archive_size,
+ file_start, file_len
+ );
+#endif
+
+ gfx_config.file = gfx_config.archive_start + file_start;
+
+ u = &realmode_callback_end - &realmode_callback_start;
+ u = (u + REALMODE_BUF_SIZE + 0xf) & ~0xf;
+
+ if(u + code_size > lowmem_size) {
+ printf("bounce buffer too small: size %u, needed %u\n", lowmem_size, u + code_size);
+ return 1;
+ }
+
+ memcpy(lowmem + REALMODE_BUF_SIZE, &realmode_callback_start, &realmode_callback_end - &realmode_callback_start);
+
+ // fill in buffer size and location
+ *(uint16_t *) (lowmem + REALMODE_BUF_SIZE) = REALMODE_BUF_SIZE;
+ *(uint16_t *) (lowmem + REALMODE_BUF_SIZE + 2) = (uint32_t) lowmem >> 4;
+
+ gfx_config.bootloader_seg = ((uint32_t) lowmem + REALMODE_BUF_SIZE) >> 4;
+ gfx_config.callback = 4; // start address
+
+ lowmem += u;
+ lowmem_size -= u;
+
+ memcpy(lowmem, archive + file_start + code_start, code_size);
+
+ gfx_config.mem0_start = (uint32_t) lowmem + code_size;
+ gfx_config.mem0_end = (uint32_t) lowmem + lowmem_size;
+ // align a bit
+ gfx_config.mem0_start = (gfx_config.mem0_start + 0xf) & ~0xf;
+
+ gfx_config.xmem_start = (uint32_t) malloc(GFX_MEMORY_SIZE << 20);
+ if(gfx_config.xmem_start) {
+ gfx_config.xmem_end = gfx_config.xmem_start + (GFX_MEMORY_SIZE << 20);
+ }
+
+ // fake; not used anyway
+ gfx_config.bios_mem_size = 256 << 20;
+
+ gfx.code_seg = (uint32_t) lowmem >> 4;
+
+ for(u = 0; u < sizeof gfx.jmp_table / sizeof *gfx.jmp_table; u++) {
+ gfx.jmp_table[u] = (gfx.code_seg << 16) + *(uint16_t *) (lowmem + 2 * u);
+ }
+
+#if 0
+ for(u = 0; u < sizeof gfx.jmp_table / sizeof *gfx.jmp_table; u++) {
+ printf("%d: 0x%08x\n", u, gfx.jmp_table[u]);
+ }
+#endif
+
+ // we are ready to start
+
+ r.esi.l = (uint32_t) &gfx_config;
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_INIT], &r, &r);
+
+ if((r.eflags.l & EFLAGS_CF)) {
+ printf("graphics initialization failed\n");
+
+ return 1;
+ }
+
+ if((gfx_config.features & 3) != 3) {
+ gfx_done();
+
+ printf("%s: boot graphics code too old, please use newer version\n", file);
+
+ return 1;
+ }
+
+
+ return 0;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+int gfx_menu_init()
+{
+ com32sys_t r;
+
+ r.esi.l = (uint32_t) &gfx_menu;
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_MENU_INIT], &r, &r);
+
+ return 0;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void gfx_done()
+{
+ com32sys_t r;
+
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_DONE], &r, &r);
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Run gfxboot main loop.
+//
+// return:
+// boot menu index (-1: go to text mode prompt)
+//
+int gfx_input()
+{
+ com32sys_t r;
+
+ r.edi.l = (uint32_t) cmdline;
+ r.ecx.l = sizeof cmdline;
+ r.eax.l = timeout * 182 / 100;
+ timeout = 0; // use timeout only first time
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_INPUT], &r, &r);
+ if((r.eflags.l & EFLAGS_CF)) r.eax.l = 1;
+
+ if(r.eax.l == 1) return -1;
+
+ return r.ebx.l;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Like read(2) but preserve bounce buffer.
+//
+ssize_t save_read(int fd, void *buf, size_t size)
+{
+ ssize_t i;
+
+ memcpy(save_buf, lowmem_buf, save_buf_size);
+ i = read(fd, buf, size);
+ memcpy(lowmem_buf, save_buf, save_buf_size);
+
+ return i;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Read file and update progress bar.
+//
+void *load_one(char *file, ssize_t *file_size)
+{
+ int fd;
+ void *buf = NULL;
+ struct stat sbuf;
+ ssize_t size = 0, cur, i;
+ com32sys_t r;
+
+ *file_size = 0;
+
+ if((fd = open(file, O_RDONLY)) == -1) {
+ printf("%s: file not found\n", file);
+ return buf;
+ }
+
+ if(!fstat(fd, &sbuf) && S_ISREG(sbuf.st_mode)) size = sbuf.st_size;
+
+ i = 0;
+
+ if(size) {
+ buf = malloc(size);
+ for(i = 1, cur = 0 ; cur < size && i > 0; cur += i) {
+ i = save_read(fd, buf + cur, CHUNK_SIZE);
+ r.eax.l = i >> gfx_config.sector_shift;
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_PROGRESS_UPDATE], &r, &r);
+ }
+ }
+ else {
+ do {
+ buf = realloc(buf, size + CHUNK_SIZE);
+ i = save_read(fd, buf + size, CHUNK_SIZE);
+ size += i;
+ r.eax.l = i >> gfx_config.sector_shift;
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_PROGRESS_UPDATE], &r, &r);
+ } while(i > 0);
+ }
+
+ close(fd);
+
+ if(i == -1) {
+ free(buf);
+ buf = NULL;
+ size = 0;
+ }
+
+ *file_size = size;
+
+ return buf;
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Locate menu entry and boot.
+//
+void boot()
+{
+ char *label, *arg, *s;
+ menu_t *menu_ptr;
+
+ label = skip_spaces(cmdline);
+ arg = skip_spaces(s = skip_nonspaces(label));
+ *s = 0;
+
+ for(menu_ptr = menu; menu_ptr; menu_ptr = menu_ptr->next) {
+ if(menu_ptr->label && !strcmp(menu_ptr->label, label)) break;
+ }
+
+ boot_entry(menu_ptr, arg);
+}
+
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// Load & run kernel.
+//
+// Returns only on error.
+//
+void boot_entry(menu_t *menu_ptr, char *arg)
+{
+ void *kernel, *initrd_buf;
+ ssize_t kernel_size = 0, initrd_size = 0;
+ struct initramfs *initrd = NULL;
+ char *file, *cmd_buf;
+ int fd;
+ struct stat sbuf;
+ com32sys_t r;
+ char *s, *s0, *t, *initrd_arg;
+
+ if(!menu_ptr) return;
+
+ if(menu_ptr->localboot) {
+ gfx_done();
+ syslinux_local_boot(atoi(arg));
+
+ return;
+ }
+
+ file = menu_ptr->kernel;
+ if(!file) file = menu_ptr->linux;
+ if(!file) return;
+
+ // first, load kernel
+
+ r.eax.l = 0; // kernel size in sectors
+
+ if((fd = open(file, O_RDONLY)) >= 0) {
+ if(!fstat(fd, &sbuf) && S_ISREG(sbuf.st_mode)) r.eax.l = sbuf.st_size >> gfx_config.sector_shift;
+ close(fd);
+ }
+
+ r.esi.l = (uint32_t) file;
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_PROGRESS_INIT], &r, &r);
+
+ kernel = load_one(file, &kernel_size);
+
+ if(!kernel) {
+ gfx_done();
+ printf("%s: read error\n", file);
+ return;
+ }
+
+ if(kernel_size < 1024 || *(uint32_t *) (kernel + 0x202) != 0x53726448) {
+ // not a linux kernel
+ gfx_done();
+ asprintf(&cmd_buf, "%s %s", menu_ptr->label, arg);
+ syslinux_run_command(cmd_buf);
+ return;
+ }
+
+ // printf("kernel = %p, size = %d\n", kernel, kernel_size);
+
+ // parse cmdline for "initrd" option
+
+ initrd_arg = menu_ptr->initrd;
+
+ s = s0 = strdup(arg);
+
+ while(*s && strncmp(s, "initrd=", sizeof "initrd=" - 1)) {
+ s = skip_spaces(skip_nonspaces(s));
+ }
+
+ if(*s) {
+ s += sizeof "initrd=" - 1;
+ *skip_nonspaces(s) = 0;
+ initrd_arg = s;
+ }
+
+ if(initrd_arg) {
+ initrd = initramfs_init();
+
+ while((t = strsep(&s, ","))) {
+ initrd_buf = load_one(t, &initrd_size);
+
+ if(!initrd_buf) {
+ printf("%s: read error\n", t);
+ free(s0);
+ return;
+ }
+
+ initramfs_add_data(initrd, initrd_buf, initrd_size, initrd_size, 4);
+
+ // printf("initrd = %p, size = %d\n", initrd_buf, initrd_size);
+ }
+ }
+
+ free(s0);
+
+ __farcall(gfx.code_seg, gfx.jmp_table[GFX_CB_PROGRESS_DONE], &r, &r);
+
+ syslinux_boot_linux(kernel, kernel_size, initrd, arg);
+}
+
+
diff --git a/com32/gfxboot/realmode_callback.asm b/com32/gfxboot/realmode_callback.asm
new file mode 100644
index 00000000..fb5461d9
--- /dev/null
+++ b/com32/gfxboot/realmode_callback.asm
@@ -0,0 +1,190 @@
+ bits 16
+
+ section .text
+
+ ; must be filled in
+f_buf_size dw 0
+f_buf_seg dw 0
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+gfx_cb:
+ push cs
+ pop ds
+
+ cmp al,cb_len
+ jae gfx_cb_80
+
+ movzx bx,al
+ add bx,bx
+ call word [bx+cb_table]
+ jmp gfx_cb_90
+
+gfx_cb_80:
+ mov al,0ffh
+gfx_cb_90:
+ retf
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Return status info.
+;
+; return:
+; edx filename buffer (64 bytes)
+;
+cb_status:
+ mov edx,cs
+ shl edx,4
+ add edx,f_name
+ xor al,al
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Open file.
+;
+; return:
+; al 0: ok, 1: file not found
+; ecx file length (al = 0)
+;
+cb_fopen:
+ mov si,f_name
+ push ds
+ pop es
+ mov ax,6
+ int 22h
+ xchg edx,eax
+ mov al,1
+ jc cb_fopen_90
+ cmp cx,[f_buf_size]
+ ja cb_fopen_90
+ or cx,cx
+ jz cb_fopen_90
+ mov [f_block_size],cx
+ or edx,edx
+ jz cb_fopen_90
+ mov [f_handle],si
+ mov [f_size],edx
+ mov ecx,edx
+ mov ax,[f_buf_size]
+ cwd
+ div word [f_block_size]
+ mov [f_blocks],ax
+
+ xor al,al
+cb_fopen_90:
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Read next chunk.
+;
+; return:
+; edx buffer address (linear)
+; ecx data length (< 64k)
+;
+cb_fread:
+ xor ecx,ecx
+ mov si,[f_handle]
+ or si,si
+ jz cb_fread_80
+ mov cx,[f_blocks]
+ mov es,[f_buf_seg]
+ xor bx,bx
+ mov ax,7
+ int 22h
+ mov [f_handle],si
+ mov al,1
+ jc cb_fread_90
+cb_fread_80:
+ xor al,al
+cb_fread_90:
+ movzx edx,word [f_buf_seg]
+ shl edx,4
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Return current working directory.
+;
+; return:
+; edx filename
+;
+cb_getcwd:
+ mov ax,15h
+ int 22h
+ mov edx,es
+ shl edx,4
+ movzx ebx,bx
+ add edx,ebx
+ xor al,al
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Set current working directory.
+;
+cb_chdir:
+ mov bx,f_name
+ push ds
+ pop es
+ mov ax,25h
+ int 22h
+ xor al,al
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; read sector
+;
+; edx sector
+;
+; return:
+; edx buffer (linear address)
+;
+; Note: does not return on error!
+;
+cb_readsector:
+ xor edi,edi
+ xor esi,esi
+ mov cx,1
+ mov es,[f_buf_seg]
+ xor bx,bx
+ mov ax,19h
+ int 22h
+ movzx edx,word [f_buf_seg]
+ shl edx,4
+ xor al,al
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+; Re-read fs structures.
+;
+cb_mount:
+ mov ax,26h
+ int 22h
+ setc al
+ ret
+
+
+; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+;
+ align 2, db 0
+
+cb_table dw cb_status
+ dw cb_fopen
+ dw cb_fread
+ dw cb_getcwd
+ dw cb_chdir
+ dw cb_readsector
+ dw cb_mount
+cb_len equ ($-cb_table)/2
+
+f_handle dw 0
+f_block_size dw 0
+f_blocks dw 0
+f_size dd 0
+f_name times 64 db 0
+f_name_len equ $ - f_name
+