small changes, part 1

6 files changed, 26 insertions, 9 deletions

diff --git a/src/bootloader.asm b/src/bootloader.asm
index 08d1daf..583c169 100644
--- a/src/bootloader.asm
+++ b/src/bootloader.asm
@@ -24,7 +24,7 @@ fat_header:
 .oem_name            equ 0x7c03;mkfs.fat    - ignored
 .bytes_per_sector    equ 0x7c0b;0x0200      - assumed
 .sectors_per_cluster equ 0x7c0d;0x01        - assumed
-.reserved_sectors    equ 0x7c0e;0x0004      - other values handled
+.reserved_sectors    equ 0x7c0e;0x0002      - handled
 .n_fats              equ 0x7c10;0x01        - assumed
 .root_dir_entries    equ 0x7c11;            -
 .n_sectors           equ 0x7c13;0x0b40      -
@@ -231,6 +231,12 @@ load_kernel:
   mov word [dap.offset], bx
   xor bx, bx
   shr ebx, 4
+  jmp .over_sig
+
+times $$ + 0x01fe - $ db 0
+dw 0xaa55
+
+.over_sig:
   test ebx, 0xffff_0000
   jnz halt
   mov word [dap.segment], bx
@@ -269,9 +275,7 @@ load_kernel:
 
   mov ebx, dword [pointers.kernel]
 
-  ;Parse kernel executable header,
-  ;Go through relocation tables,
-  ;Get kernel_start.
+  ;TODO
 
   cli
 
@@ -292,7 +296,7 @@ dq 0x00c0_9200_8000_0ff7
 
 dap:
 dw 0x0010
-.length  dw 0x0003
+.length  dw 0x0001
 .offset  dw 0x7e00
 .segment dw 0x0000
 .start   dd 0x0000_0001
diff --git a/src/kernel/link.ld b/src/kernel/link.ld
new file mode 100644
index 0000000..64dd0be
--- /dev/null
+++ b/src/kernel/link.ld
@@ -0,0 +1,11 @@
+OUTPUT_FORMAT(binary)
+SECTIONS {
+  . = 0x01000000;
+  .text : {
+    main = .;
+    *(.text)
+  }
+  .rodata : { *(.rodata) }
+  .data : { *(.data) }
+  .bss : { *(.bss) }
+}
\ No newline at end of file
diff --git a/src/kernel/main.c b/src/kernel/main.c
index 54b0a83..6a8630b 100644
--- a/src/kernel/main.c
+++ b/src/kernel/main.c
@@ -24,12 +24,14 @@ OF THIS SOFTWARE.
 #include "misc.h"
 
 void main(void) {
+  *(uint16_t *)0x0000200e = 0x0000;
+
   *(uint32_t *)0x0000050c = (uint32_t)allocate_pages(16 * sizeof(struct file_handle_info), 2);
   for (struct file_handle_info *i = FILE_HANDLES, *l = FILE_HANDLES + 65536; i < l; ++i)
     i->first_sector = 0;
 
   *(uint32_t *)0x00000510 = (uint32_t)allocate_pages(16 * sizeof(struct proc_info), 2);
-  for (struct proc_info *i = FILE_HANDLES, *l = FILE_HANDLES + 65536; i < l; ++i)
+  for (struct proc_info *i = PROCS, *l = PROCS + 65536; i < l; ++i)
     i->memory_start = 0;
 
   uint16_t pages_free = 0, pages_total = 0;
diff --git a/src/kernel/mem.c b/src/kernel/mem.c
index f12fbf7..509c768 100644
--- a/src/kernel/mem.c
+++ b/src/kernel/mem.c
@@ -36,6 +36,6 @@ void *allocate_pages(uint16_t n_pages, uint16_t proc_n) {
 }
 
 void deallocate_pages(void *from, uint16_t n_pages) {
-  for (uint16_t *mb = MMAP + ((uint32_t)from / 0x1000), *l = mb + n_pages; mb < l; ++mb)
+  for (uint16_t *mb = MMAP + (uint32_t)from / 0x1000, *l = mb + n_pages; mb < l; ++mb)
     *mb = 0;
 }
\ No newline at end of file
diff --git a/src/kernel/misc.h b/src/kernel/misc.h
index c68bccc..d333f26 100644
--- a/src/kernel/misc.h
+++ b/src/kernel/misc.h
@@ -22,6 +22,6 @@ OF THIS SOFTWARE.
 #ifndef MISC_H
 #define MISC_H
 
-void print_32(uint32_t n);
+void put_16(uint16_t n);
 
 #endif
\ No newline at end of file
diff --git a/src/kernel/proc.c b/src/kernel/proc.c
index dba6b92..a0fb863 100644
--- a/src/kernel/proc.c
+++ b/src/kernel/proc.c
@@ -25,7 +25,7 @@ uint16_t new_proc(uint8_t *file) {
   uint16_t handle = open_file(file);
   if (handle)
     for (uint16_t id = 3; id; ++id)
-      if (!(PROCS[id].memory_start)) {
+      if (!PROCS[id].memory_start) {
         uint32_t size = get_size(id);
         void *mem = PROCS[id].memory_start = allocate_pages(PROCS[id].n_pages = (size - 1) / 4096 + 1, id);
         read_file(handle, size, mem);