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https://opencores.org/ocsvn/eco32/eco32/trunk
Subversion Repositories eco32
[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [boot.c] - Rev 187
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/* * boot.c -- bootstrap from disk */ #include "common.h" #include "stdarg.h" #include "romlib.h" #include "boot.h" #include "cpu.h" #include "mmu.h" #include "start.h" void boot(int dskno) { Word capacity; Byte sig1, sig2; capacity = dskcap(dskno); if (capacity == 0) { printf("Disk not found!\n"); return; } printf("Disk with 0x%08X sectors found, booting...\n", capacity); if (dskio(dskno, 'r', 0, PHYS_BOOT, 1) != 0) { printf("Disk error!\n"); return; } sig1 = mmuReadByte(VIRT_BOOT + 512 - 2); sig2 = mmuReadByte(VIRT_BOOT + 512 - 1); if (sig1 != 0x55 || sig2 != 0xAA) { printf("MBR signature missing!\n"); return; } /* * Boot convention: * $16 disk number of boot disk * $17 start sector number of disk or partition to boot * $18 total number of sectors of disk or partition to boot */ cpuSetReg(16, dskno); cpuSetReg(17, 0); cpuSetReg(18, capacity); cpuSetPC(VIRT_BOOT); cpuRun(); }
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