m68k-backplane-computer/rom
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Remove blank line from end of build_rom.sh

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pjht 2022-11-14 15:35:17 -06:00
parent a71be16a93
commit ebbb0b19ed
2 changed files with 53 additions and 1 deletions
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1
build_rom.sh
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@ -2,4 +2,3 @@
m68k-elf-as -m68010 --register-prefix-optional -o rom.o rom.68k
m68k-elf-ld -z max-page-size=1 -T rom.ld -o rom.elf rom.o
m68k-elf-objcopy -O binary rom.elf rom.bin

53
ram_map.c Executable file
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@ -0,0 +1,53 @@
#include <stdint.h>
uint8_t find_all_ram_cards(uint8_t* buf /* a1 */) {
uint8_t len = 0; // move.b 0, d0
void* curr_card = (void*)0xff0000; // a0 = 0xff0000
while(1) { // farc_loop:
curr_card += 0x100; // lea (0x100, a0), a0
uint8_t type = *((uint8_t*)(curr_card+0xff)); // move.b (0xff, a0), d0
if (type == 0) { // beq.b farc_done
break;
}
if (type != 2) { // cmp.b #0x2, d0; bne.b farc_loop
continue;
}
*buf = (uint8_t)((uint32_t)curr_card>>16);
buf += 1; // inc a1
len += 1; // inc d1
} // bra.b farc_loop
// farc_done:
return len;
}
void sort_ram_cards(uint8_t* buf) {
uint8_t len = find_all_ram_cards(buf);
// Insertion sort buf using the aligment of the cards
uint8_t i = 1;
while(1) {
if (i >= len) {
break;
}
uint8_t num = buf[i];
void* card = (void*)((uint32_t)num<<16);
*((uint32_t*)card)=0xfffffffe;
uint32_t x = ~(*((uint32_t*)card)) + 1;
uint8_t j = i - 1;
while(1) {
if (j == 0) {
break;
}
uint8_t num = buf[j];
void* card = (void*)((uint32_t)num<<16);
*((uint32_t*)card)=0xfffffffe;
uint32_t aj = ~(*((uint32_t*)card)) + 1;
if (aj <= x) {
break;
}
buf[j + 1] = buf[j];
j = j - 1;
}
buf[j + 1] = buf[i];
i = i + 1;
}
}