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Add some basic code, build kernel stuff in tree

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This commit is contained in:
Byron Lathi
2023-12-04 23:06:00 -08:00
parent 902b1b5bb9
commit 2859055f98
6 changed files with 77 additions and 65 deletions
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1
sw/fsdir/test.txt Normal file
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@@ -0,0 +1 @@
This is a text file, which is composed of text.

9
sw/kernel/filesystems/fat32.h
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@@ -5,6 +5,12 @@
void fat32_init();
extern uint32_t root_cluster;
extern uint16_t fat_start_sector;
extern uint32_t data_start_sector;
extern uint32_t fat_size;
extern uint8_t* sd_buf;
struct fat32_directory_entry {
char file_name[8];
char file_ext[3];
@@ -31,4 +37,7 @@ struct lfn_entry {
uint16_t name_2[2];
};
uint8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry);
uint8_t fat32_read_cluster(uint32_t cluster, void* buf);
#endif

90
sw/kernel/filesystems/fat32.s
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@@ -9,14 +9,16 @@
.export _fat32_init
.export _root_cluster, _fat_start_sector, _data_start_sector, _fat_size, _sd_buf
.data
root_cluster: .res 4
fat_start_sector: .res 2
data_start_sector: .res 4
fat_size: .res 4
_root_cluster: .res 4
_fat_start_sector: .res 2
_data_start_sector: .res 4
_fat_size: .res 4
sd_buf: .res 512
_sd_buf: .res 512
data_start_sect_str: .asciiz "Data sector start: 0x%lx\n"
starting_cluster_str: .asciiz "Root cluster num: %lx\n";
@@ -24,12 +26,12 @@ value_str: .asciiz "Value: 0x%x\n"
.code
bytes_per_sector = sd_buf + $0B
sectors_per_cluster = sd_buf + $0D
reserved_sectors = sd_buf + $0E
fat_count = sd_buf + $10
sectors_per_fat = sd_buf + $24
root_cluster_offs = sd_buf + $2C
bytes_per_sector = _sd_buf + $0B
sectors_per_cluster = _sd_buf + $0D
reserved_sectors = _sd_buf + $0E
fat_count = _sd_buf + $10
sectors_per_fat = _sd_buf + $24
root_cluster_offs = _sd_buf + $2C
.proc _fat32_init
; load sector 0 into sd_buf
@@ -38,8 +40,8 @@ root_cluster_offs = sd_buf + $2C
stz sreg
stz sreg+1
jsr pusheax
lda #<sd_buf
ldx #>sd_buf
lda #<_sd_buf
ldx #>_sd_buf
jsr pushax
lda #<ptr1
ldx #>ptr1
@@ -47,7 +49,7 @@ root_cluster_offs = sd_buf + $2C
ldx #$00
L1: lda root_cluster_offs,x
sta root_cluster,x
sta _root_cluster,x
inx
cpx #$4
blt L1
@@ -60,8 +62,8 @@ L1: lda root_cluster_offs,x
jsr _imulii
txa
lsr
sta fat_start_sector
stz fat_start_sector + 1
sta _fat_start_sector
stz _fat_start_sector + 1
; multiply fat size and number of fats to get total fat size
lda fat_count
@@ -69,53 +71,25 @@ L1: lda root_cluster_offs,x
lda sectors_per_fat
ldx sectors_per_fat+1
jsr _lmulii
sta fat_size
stx fat_size+1
sta _fat_size
stx _fat_size+1
lda sreg
sta fat_size+2
sta _fat_size+2
lda sreg+1
sta fat_size+3
sta _fat_size+3
; Add fat size to starting fat sector to get data start sector
lda fat_size
adc fat_start_sector
sta data_start_sector
lda fat_size+1
adc fat_start_sector+1
sta data_start_sector+1
lda fat_size+2
sta data_start_sector+2
lda fat_size+3
sta data_start_sector+3
lda #<data_start_sect_str
ldx #>data_start_sect_str
jsr pushax
lda data_start_sector+2
sta sreg
lda data_start_sector+3
sta sreg+1
lda data_start_sector
ldx data_start_sector+1
jsr pusheax
ldy #$6
jsr _cprintf
; load sector <data_start> into sd_buf
lda data_start_sector+2
sta sreg
lda data_start_sector+3
sta sreg+1
lda data_start_sector
ldx data_start_sector+1
jsr pusheax
lda #<sd_buf
ldx #>sd_buf
jsr pushax
lda #<ptr1
ldx #>ptr1
jsr _SD_readSingleBlock
lda _fat_size
adc _fat_start_sector
sta _data_start_sector
lda _fat_size+1
adc _fat_start_sector+1
sta _data_start_sector+1
lda _fat_size+2
sta _data_start_sector+2
lda _fat_size+3
sta _data_start_sector+3
rts
.endproc

26
sw/kernel/filesystems/fat32_c.c Normal file
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@@ -0,0 +1,26 @@
#include "fat32.h"
#include <devices/sd_card.h>
#include <conio.h>
#include <stdint.h>
uint8_t fat32_read_cluster(uint32_t cluster, void* buf) {
uint8_t error;
uint32_t addr = (cluster - 2) + data_start_sector;
SD_readSingleBlock(addr, buf, &error);
return error;
}
uint8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry) {
struct fat32_directory_entry* local_entry;
int i = 0;
fat32_read_cluster(root_cluster, sd_buf);
for (i = 0; i < 16; i++){
local_entry = sd_buf + i*32;
if (local_entry->attr1 == 0xf || local_entry->attr1 & 0x8 || !local_entry->attr1) {
continue;
}
cprintf("Name: %.11s\n", local_entry->file_name, local_entry->file_ext);
cprintf("attr1: %x\n", local_entry->attr1);
}
}

13
sw/test_code/fs_test/Makefile
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@@ -1,7 +1,7 @@
CC=../../cc65/bin/cl65
LD=../../cc65/bin/cl65
SIM=../../cc65/bin/sim65
CFLAGS=-T -t sim65c02 -I.
CFLAGS=-T -t sim65c02 -I. -I $(REPO_TOP)/sw/kernel
LDFLAGS=-m $(NAME).map
NAME=fs_test
@@ -14,17 +14,18 @@ FS=$(REPO_TOP)/sw/script/fs.fat
LISTS=lists
EXT_SRCS=$(REPO_TOP)/sw/kernel/filesystems/fat32.s
EXT_SRCS=$(REPO_TOP)/sw/kernel/filesystems/fat32.s $(REPO_TOP)/sw/kernel/filesystems/fat32_c.c
SRCS=$(wildcard *.s) $(wildcard *.c)
SRCS+=$(wildcard **/*.s) $(wildcard **/*.c)
SRCS+=$(EXT_SRCS)
OBJS+=$(patsubst %.s,%.o,$(filter %s,$(SRCS)))
OBJS+=$(patsubst %.c,%.o,$(filter %c,$(SRCS)))
run: all
$(SIM) $(SIMARGS) $(BIN)
all: fs.fat fat32.s $(BIN)
all: fs.fat $(BIN)
$(BIN): $(OBJS)
$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) -o $@
@@ -35,16 +36,14 @@ $(BIN): $(OBJS)
%.o: %.s $(LISTS)
$(CC) $(CFLAGS) -l $(LISTS)/$<.list -c $< -o $@
fat32.s: $(EXT_SRCS)
cp $^ .
fs.fat: $(FS)
cp $^ .
$(LISTS):
mkdir -p $(addprefix $(LISTS)/,$(sort $(dir $(SRCS))))
.PHONY: clean
clean:
rm -rf $(OBJS) $(BIN) $(HEX) $(LISTS) $(NAME).map fat32.s
rm -rf $(OBJS) $(BIN) $(HEX) $(LISTS) $(NAME).map

3
sw/test_code/fs_test/main.c
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@@ -1,8 +1,11 @@
#include <stdio.h>
#include <filesystems/fat32.h>
void fat32_init(void);
int main(void) {
struct fat32_directory_entry dentry;
fat32_init();
fat32_get_cluster_by_name("KERNEL O65", &dentry);
return 0;
}