From f23390bfddcc23940178f04c6745d9c7fcf9d1ea Mon Sep 17 00:00:00 2001 From: Joshua Wise Date: Fri, 5 Sep 2008 16:12:15 -0400 Subject: [PATCH] add aseg and loader --- aseg/aseg.asm | 130 +++++++++++++++++++++++++++++++++++++++++++++++ aseg/load-aseg.c | 109 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 239 insertions(+) create mode 100644 aseg/aseg.asm create mode 100644 aseg/load-aseg.c diff --git a/aseg/aseg.asm b/aseg/aseg.asm new file mode 100644 index 0000000..51a2811 --- /dev/null +++ b/aseg/aseg.asm @@ -0,0 +1,130 @@ + org 0x0 +[bits 16] +entry: +; mov al, 0x01 ; Say where we are. +; out 0x80, al + mov ax, 0xA800 + mov ds, ax ; Take us out of flat unreal mode, and + mov es, ax ; put us in true real mode. + mov fs, ax + mov gs, ax + mov ss, ax + jmp 0xA800:entry2 ; Long jump to a correct cs. +entry2: +; mov al, 0x02 +; out 0x80, al + lgdt [gdtr] ; Set up a new GDT. + mov eax, 0x1 + mov cr0, eax ; ... and enter pmode! + mov al, 0x03 ; Say we got here. + out 0x80, al + jmp long 0x10:(continue+0xA8000) ; Now longjmp into the new code. +[bits 32] +continue: +; mov al, 0x04 ; Now we're in protected mode. +; out 0x80, al + + mov ax, 0x08 ; Set up segment selectors. + mov ds, ax + mov es, ax + mov fs, ax + mov gs, ax + mov ss, ax + mov esp, 0x1fffffff + +; mov al, 0x05 +; out 0x80, al + + mov al, [(cstat + 0xA8000)] + add al, 1 + out 0x80, al + mov [(cstat + 0xA8000)], al + + mov eax, 0x11223344 + mov dword [(status + 0xA8000)], eax + + mov dx, 0xCF8 ; save off the old config value + in dword eax, dx + mov [esp-4], eax + + mov eax, 0x80000070 ; load in smramc + out dx, eax + mov dx, 0xCFC + in byte al, dx + mov [esp-5], al + and al, 0xF3 ; Allow graphics access + or al, 0x08 + out dx, al + + xor eax, eax + mov dx, 0x3D4 + in byte al, dx + mov [esp-6], al ; save off the old VGA command + mov al, 0xC + out dx, al + inc dx + in al, dx + mov ah, al + dec dx + mov al, 0xD + out dx, al + inc dx + in al, dx + shl eax, 1 + add eax, 0xB8000 ; yay + mov byte [eax+0], '1' + mov byte [eax+1], 0xA0 + mov byte [eax+2], '5' + mov byte [eax+3], 0xA0 + mov byte [eax+4], '-' + mov byte [eax+5], 0xA0 + mov byte [eax+6], '4' + mov byte [eax+7], 0xA0 + mov byte [eax+8], '1' + mov byte [eax+9], 0xA0 + mov byte [eax+10], '2' + mov byte [eax+11], 0xA0 + + mov dx, 0x3D4 + mov al, [esp-6] + out dx, al + + + mov dx, 0xCFC ; restore smramc + mov al, [esp-5] + out dx, al + + mov dx, 0xCF8 ; restore the old config value + mov eax, [esp-4] + out dx, eax + + mov al, 0x40 ; ack the periodic IRQ + mov dx, 0x834 + out dx, al + + mov dx, 0x830 + in al, dx + or al, 0x02 ; now ack the SMI itself + and al, 0xBF + out dx, al + or al, 0x40 + out dx, al + + rsm ; and leave SMM + + align 0x4 +gdtr: + db 0x27, 0x00 + dd (gdt + 0xA8000) + align 0x4 +gdt: + db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x93, 0xCF, 0x00 ; data segment + db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9B, 0xCF, 0x00 ; code segment + db 0xFF, 0xFF, 0x00, 0x80, 0x0A, 0x9B, 0xCF, 0x00 ; code segment for trampoline + +TIMES 512-($-$$) DB 0 +status: + dd 0xAA55AA55 +cstat: + db 0x00 diff --git a/aseg/load-aseg.c b/aseg/load-aseg.c new file mode 100644 index 0000000..6faa1ac --- /dev/null +++ b/aseg/load-aseg.c @@ -0,0 +1,109 @@ +/* + * devmem2.c: Simple program to read/write from/to any location in memory. + * + * Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl) + * + * + * This software has been developed for the LART computing board + * (http://www.lart.tudelft.nl/). The development has been sponsored by + * the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/) + * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/) + * projects. + * + * The author can be reached at: + * + * Jan-Derk Bakker + * Information and Communication Theory Group + * Faculty of Information Technology and Systems + * Delft University of Technology + * P.O. Box 5031 + * 2600 GA Delft + * The Netherlands + * + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \ + __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0) + +#define MAP_SIZE 4096UL +#define MAP_MASK (MAP_SIZE - 1) + +int main(int argc, char **argv) { + + int fd, input_fd; + + void *map_base, *virt_addr; + unsigned long read_result, writeval; + off_t target; + int access_type = 'w'; + + if(argc < 3) { + fprintf(stderr, "\nUsage:\t%s { address } { file }\n" + "\taddress : memory address to act upon\n" + "\tfile : file to load\n\n", argv[0]); + exit(1); + } + + input_fd = open(argv[2], O_RDONLY); + if (input_fd < 0) FATAL; + + struct stat st; + if (fstat(input_fd, &st) < 0) FATAL; + + char * buf = malloc(st.st_size); + if (!buf) FATAL; + if (read(input_fd, buf, st.st_size) != st.st_size) FATAL; + + target = strtoul(argv[1], 0, 0); + + fd = open("/dev/mem", O_RDWR | O_SYNC); + if (fd < 0) FATAL; + + printf("/dev/mem opened.\n"); + fflush(stdout); + + /* Map one page */ + map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, target & ~MAP_MASK); + + if (map_base == (void *) -1) FATAL; + + printf("Memory mapped at address %p.\n", map_base); + fflush(stdout); + + virt_addr = map_base + (target & MAP_MASK); + memcpy(virt_addr, buf, st.st_size); + + printf("Copied %d bytes.\n", st.st_size); + + return 0; +} -- 2.43.0