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Added initrd driver

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Marco Cetica
2021-02-05 13:05:05 +01:00
parent dd48ba577d
commit f263f3f481
5 changed files with 113 additions and 10 deletions
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63
kernel/drivers/initrd.c
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@@ -1,26 +1,79 @@
#include "initrd.h"
// Private API to IO operations on dir and files
static uint32_t initrd_read(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
static struct dirent *initrd_readdir(fs_node_t *node, uint32_t index);
static fs_node_t *initrd_finddir(fs_node_t *node, uint8_t *name);
// Declare various things
initrd_header_t *initrd_header; // Header
initrd_file_header_t *file_header; // List of headers
initrd_file_header_t *file_headers; // List of headers
fs_node_t *initrd_root; // Directory root node
fs_node_t *initrd_dev; // Directory dev node(/dev)
fs_node_t *root_nodes; // List of file nodes
uint32_t nroot_nodes;
uint32_t nroot_nodes; // Number of file nodes
struct dirent dirent;
fs_node_t *init_ramdisk(uint32_t multiboot_location) {
// Initialize main and file headers
initrd_header = (initrd_header_t*)multiboot_location;
file_header = (initrd_file_header_t*)(multiboot_location+sizeof(initrd_header_t));
file_headers = (initrd_file_header_t*)(multiboot_location+sizeof(initrd_header_t));
// Initialize root directory
initrd_root = (fs_node_t*)
initrd_root = (fs_node_t*)kmalloc(sizeof(fs_node_t));
strcpy(initrd_root->name, "initrd");
initrd_root->mask = initrd_root->uid = initrd_root->gid = initrd_root->inode = initrd_root->length = 0;
initrd_root->flags = FS_DIRECTORY;
initrd_root->read = 0;
initrd_root->write = 0;
initrd_root->open = 0;
initrd_root->close = 0;
initrd_root->readdir = &initrd_readdir;
initrd_root->finddir = &initrd_finddir;
initrd_root->ptr = 0;
initrd_root->impl = 0;
// Initialize the /dev/ directory
initrd_dev = (fs_node_t*)kmalloc(sizeof(fs_node_t));
strcpy(initrd_root->name, "dev");
initrd_root->mask = initrd_root->uid = initrd_root->gid = initrd_root->inode = initrd_root->length = 0;
initrd_root->flags = FS_DIRECTORY;
initrd_root->read = 0;
initrd_root->write = 0;
initrd_root->open = 0;
initrd_root->close = 0;
initrd_root->readdir = &initrd_readdir;
initrd_root->finddir = &initrd_finddir;
initrd_root->ptr = 0;
initrd_root->impl = 0;
// Add dev and root directories to the ramdisk
// Let us first allocate space for them
root_nodes = (fs_node_t*)kmalloc(sizeof(fs_node_t) *initrd_header->nfiles);
nroot_nodes = initrd_header->nfiles;
// and then, add each file to an inode
for(uint32_t i = 0; i < initrd_header->nfiles; i++) {
file_headers[i].offset += multiboot_location;
// Create an inode for the file
strcpy(root_nodes[i].name, &file_headers[i].name);
root_nodes[i].mask = root_nodes[i].uid = root_nodes[i].gid = 0;
root_nodes[i].length = file_headers[i].length;
root_nodes[i].inode = i;
root_nodes[i].flags = FS_FILE;
root_nodes[i].read = &initrd_read;
root_nodes[i].write = 0;
root_nodes[i].readdir = 0;
root_nodes[i].finddir = 0;
root_nodes[i].open = 0;
root_nodes[i].close = 0;
root_nodes[i].impl = 0;
}
return initrd_root;
}
static uint32_t initrd_read(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
initrd_file_header_t header = file_header[node->inode];
initrd_file_header_t header = file_headers[node->inode];
if(offset > header.length)
return 0;
if(offset+size > header.length)