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4 Commits
9f41ddd242
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99f290634f
Author | SHA1 | Date | |
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99f290634f | |||
bdb0841286 | |||
28cd244b45 | |||
edbf5121e2 |
@ -38,7 +38,9 @@ OBJS = \
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pic/pic.o \
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pic/keyboard.o \
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pic/pit.o \
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utils/ring_buffer.o
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utils/ring_buffer.o \
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iso.o \
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fd.o
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DEPS = $(OBJS:.o=.d)
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@ -17,7 +17,8 @@ static void busy_wait(uint16_t drive)
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static void wait_device_selection(uint16_t drive)
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{
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for (int i = 0; i < 400; ++i)
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for (int i = 0; i < 4000; ++i)
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//printf("wait\r\n");
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inb(drive);
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}
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37
k/fd.c
Normal file
37
k/fd.c
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@ -0,0 +1,37 @@
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#include "fd.h"
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static struct file_entry fd_table[MAX_FD] = { 0 };
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static int find_next_fd(void)
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{
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for (int fd = 0; fd < MAX_FD; ++fd)
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{
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if (!fd_table[fd].open)
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return fd;
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}
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return -1;
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}
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int register_fd(u32 lba)
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{
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int free_fd = find_next_fd();
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if (free_fd < 0)
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return -1;
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struct file_entry f = { .open = 1, .lba = lba, .file_offset = 0 };
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fd_table[free_fd] = f;
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return free_fd;
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}
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int destroy_fd(int fd)
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{
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if (fd > MAX_FD || !fd_table[fd].open)
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return -1;
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fd_table[fd].open = 0;
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fd_table[fd].lba = 0;
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fd_table[fd].file_offset = 0;
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return 0;
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}
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18
k/fd.h
Normal file
18
k/fd.h
Normal file
@ -0,0 +1,18 @@
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#ifndef FD_H
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#define FD_H
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#include <k/types.h>
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#define MAX_FD 65535
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struct file_entry
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{
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u8 open;
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u32 lba;
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u64 file_offset;
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};
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int register_fd(u32 lba);
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int destroy_fd(int fd);
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#endif /* !FD_H */
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73
k/iso.c
Normal file
73
k/iso.c
Normal file
@ -0,0 +1,73 @@
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#include <k/iso9660.h>
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#include <k/types.h>
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#include "atapi.h"
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#include "fd.h"
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#include "iso.h"
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#include "stdio.h"
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#include "string.h"
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static u32 get_filename_length(const char *path, u32 *index)
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{
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u32 len = 0;
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for (; path[*index]; ++(*index))
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{
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if (path[*index] != '/')
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++len;
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else {
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while (path[*index] == '/')
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++(*index);
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break;
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}
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}
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return len;
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}
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int open(const char *pathname, int flags)
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{
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if (flags != O_RDONLY)
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return -1;
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struct iso_prim_voldesc *iso_prim_block = read_block(ISO_PRIM_VOLDESC_BLOCK);
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if (strncmp(iso_prim_block->std_identifier, "CD001", 5))
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return -1;
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struct iso_dir *root = &iso_prim_block->root_dir;
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struct iso_dir *curr = read_block(root->data_blk.le);
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u32 index = 0;
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while (pathname[index] == '/')
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++index;
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for (int depth = 0; depth < MAX_DIR_DEPTH; ++depth)
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{
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char found = 0;
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u32 start = index;
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u32 length = get_filename_length(pathname, &index);
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// we found the file
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if (!length)
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return register_fd(curr->data_blk.le);
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// iteration for one directory
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while (curr->dir_size != 0)
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{
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if (length == curr->idf_len &&
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!strncmp(pathname + start, curr->idf, length))
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{
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curr = read_block(curr->data_blk.le);
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found = 1;
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break;
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}
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else
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curr = (void *)curr + curr->dir_size;
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}
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if (!found)
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return -1;
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}
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return -1;
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}
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10
k/iso.h
Normal file
10
k/iso.h
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@ -0,0 +1,10 @@
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#ifndef ISO_H
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#define ISO_H
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#include <k/types.h>
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#define O_RDONLY 0
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int open(const char *path, int flags);
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#endif /* !ISO_H */
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5
k/k.c
5
k/k.c
@ -31,6 +31,7 @@
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#include "serial.h"
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#include "stdio.h"
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#include "iso.h"
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#include "atapi.h"
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static void k_init(void)
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{
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@ -52,10 +53,6 @@ void k_main(unsigned long magic, multiboot_info_t *info)
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k_init();
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//printf("bonjour\r\n");
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poggers();
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for (unsigned i = 0; ; ) {
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*fb = star[i++ % 4];
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}
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