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Updated InitRD to use virtual mappings

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apio 2022-09-10 22:15:19 +02:00
parent 4aeada05d3
commit f98a45aefe
2 changed files with 21 additions and 5 deletions
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4
kernel/include/init/InitRD.h
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@ -36,9 +36,11 @@ namespace InitRD
int get_total_blocks();
File get_file(TarHeader* header);
void free_file(File& file);
TarHeader* get_block(int block_index);
bool is_valid_header(TarHeader* header);
File find_file(const char* filename);
File open(const char* filename);
void close(File& f);
void for_each(void (*callback)(File& file));
}

22
kernel/src/init/InitRD.cpp
View File

@ -1,6 +1,7 @@
#include "init/InitRD.h"
#include "bootboot.h"
#include "io/Serial.h"
#include "memory/KernelMemoryManager.h"
#include "std/stdlib.h"
#include <string.h>
@ -31,7 +32,6 @@ InitRD::File InitRD::get_file(TarHeader* header)
File result;
result.size = 0;
memcpy(result.name, header->name, 100);
result.addr = (void*)(header + TAR_BLOCKSIZE);
int multiplier =
1; // why they decided to store the size as an octal-encoded string instead of an integer is beyond me
for (int i = 10; i >= 0; i--)
@ -39,21 +39,28 @@ InitRD::File InitRD::get_file(TarHeader* header)
result.size += (multiplier * (header->size[i] - 48));
multiplier *= 8;
}
result.addr = KernelMemoryManager::get_unaligned_mappings((void*)(header + TAR_BLOCKSIZE), result.size / 4096 + 1);
result.size_in_blocks = result.size / TAR_BLOCKSIZE + 1;
return result;
}
InitRD::File InitRD::find_file(const char* filename)
void InitRD::free_file(File& file)
{
KernelMemoryManager::release_unaligned_mappings(file.addr, file.size / 4096 + 1);
}
InitRD::File InitRD::open(const char* filename)
{
int block = 0;
int total_blocks = get_total_blocks();
while (block < total_blocks)
{
TarHeader* hdr = get_block(block);
TarHeader* hdr = (TarHeader*)KernelMemoryManager::get_unaligned_mapping(get_block(block));
block++;
if (hdr->typeflag == 53) { continue; } // Directory
if (!is_valid_header(hdr)) { continue; }
auto f = get_file(hdr);
KernelMemoryManager::release_unaligned_mapping(hdr);
if (strncmp(hdr->name, filename, strlen(filename)) == 0) { return f; }
block += get_file_size_in_blocks(f);
}
@ -64,18 +71,25 @@ InitRD::File InitRD::find_file(const char* filename)
return nullFile;
}
void InitRD::close(File& file)
{
free_file(file);
}
void InitRD::for_each(void (*callback)(File& f))
{
int block = 0;
int total_blocks = get_total_blocks();
while (block < total_blocks)
{
TarHeader* hdr = get_block(block);
TarHeader* hdr = (TarHeader*)KernelMemoryManager::get_unaligned_mapping(get_block(block));
block++;
if (hdr->typeflag == 53) { continue; } // Directory
if (!is_valid_header(hdr)) { continue; }
auto f = get_file(hdr);
block += get_file_size_in_blocks(f);
KernelMemoryManager::release_unaligned_mapping(hdr);
callback(f);
close(f);
}
}