chore: remove useless file and trying refactor bootloader

boot/README.org

@@ -15,7 +15,7 @@
          |                       |
 0x008000 +-----------------------+
          |                       |
-         | Boot0                 |
+         | bootsector            |
          |                       |
 0x007000 +-----------------------+
          |                       |
@@ -23,7 +23,7 @@
          |                       |
 0x006000 +-----------------------+
          |                       |
-         | Boot1                 |
+         | stpdldr.sys           |
          |                       |
 0x001000 +-----------------------+
          |                       |

boot/common/bios.inc

@@ -1,3 +1,12 @@
+	;; File: bios.inc
+
+
+	;; Function: bios_print
+	;;
+	;; Parameters:
+	;;
+	;;     si - null-terminated string to print
+	;;
 bios_print:
 	lodsb
 	or al, al

boot/common/protocol.inc

@@ -0,0 +1,4 @@
+struct BootProtocol
+{
+	
+}

boot/efi/bootia32.asm

@@ -1,4 +1,4 @@
-	; File: bootia32.asm
+	;; File: bootia32.asm
 	format PE DLL EFI at 10000000h
 	entry efimain
 
@@ -8,9 +8,17 @@
 	include '../common/macro.inc'
 	include 'uefi.inc'
 
-	; ESP     => return address
+	;; Function: efimain
-	; ESP + 4 => Handle
+	;;
-	; ESP + 8 => SysTable
+	;; Parameters:
+	;;
+	;;     [esp+4] - handle
+	;;     [esp+8] - <EFI_SYSTEM_TABLE>
+	;;
+	;; Returns:
+	;;
+	;;     eax - efi status
+	;;
 efimain:
 	mov eax, [esp+4]
 	mov [handle], eax

boot/efi/uefi.inc

@@ -1,3 +1,5 @@
+	;; File: uefi.inc
+
 struc BOOLEAN
 {
 	. db ?
@@ -112,6 +114,7 @@ EFI_1_02_SYSTEM_TABLE_REVISION = ((1 shl 16) or (02))
 EFI_SYSTEM_TABLE_REVISION = EFI_2_90_SYSTEM_TABLE_REVISION
 EFI_SPECIFICATION_VERSION = EFI_SYSTEM_TABLE_REVISION
 
+	;; Struct: EFI_SYSTEM_TABLE
 struc EFI_SYSTEM_TABLE
 {
 	.Hdr                  EFI_TABLE_HEADER

boot/intro.txt

@@ -0,0 +1,4 @@
+File: Introduction
+
+About: Legacy
+

boot/loader/gdt.inc

@@ -0,0 +1,18 @@
+
+gdt:
+	; null descriptor
+	dd 0
+	dd 0
+
+	; code descriptor
+	dw 0xFFFF, 0x0000
+	db 0x00, 0x9a, 0xcf, 0x00
+
+	; data descriptor
+	dw 0xFFFF, 0x0000
+	db 0x00, 0x92, 0xcf, 0x00
+.end:
+	
+gdt_ptr:
+	dw gdt.end - gdt - 1
+	dd gdt

boot/loader/loader.asm

@@ -15,10 +15,13 @@ multiboot_header:
 
 _start:
 	cmp eax, MULTIBOOT_MAGIC
-	je .multiboot
+	je multiboot
 
 	use16
-	;; non multiboot process
+
+	; =========================================================================
+	;  real mode code 
+	; =========================================================================
 	push cs
 	pop ds
 
@@ -31,12 +34,13 @@ _start:
     ; detect memory
     call memory_get_map
     jc .error_memory
-    xchg bx, bx
 
 	call video_setup
 
-.multiboot:
+	;cli
-	jmp .hang
+	;lgdt [gdt_ptr]
+	;jmp 0x8:common32
+	;jmp $
 
 .error_memory:
 	mov si, msg_error_memory
@@ -45,14 +49,15 @@ _start:
 	mov si, msg_error_a20
 .error:
 	call bios_print
-.hang:
+@@:
 	hlt
-	jmp $
+	jmp @b
 
 	include 'a20.inc'
 	include '../common/bios.inc'
 	include 'memory.inc'
 	include 'video.inc'
+	include 'gdt.inc'
 
 msg_stage2       db "StupidOS Bootloader (Stage 1)", CR, LF, 0
 msg_error_a20    db "ERROR: can't enable a20 line", CR, LF, 0
@@ -62,9 +67,33 @@ msg_error_memory db "ERROR: can't detect available memory", CR, LF, 0
 bi_screen_width:	dw 0
 bi_screen_height:	dw 0
 
+	use32
+	; =========================================================================
+	; protected mode code
+	; =========================================================================
+multiboot:
+
+common32:
+	;mov bx, 0x0f01
+	;mov word [eax], bx
+	; paging 
+	; identity map first 1MB
+	; map kernel to 0xC0000000
+
+hang:
+	hlt
+	jmp $
+
 _edata:
 
-	; BSS
+	align 4096
-	rb 0x4000
+boot_page_directory:
+	rb 4096
+
+boot_0_page_table:
+	rb 4096
+
+boot_768_page_table:
+	rb 4096
 
 _end:

boot/loader/mmu.inc

@@ -0,0 +1,7 @@
+PE_PRESENT  = (1 shl 0)
+PE_WRITABLE = (1 shl 1)
+PE_USERMODE = (1 shl 2)
+PE_ACCESSED = (1 shl 5)
+PE_DIRTY    = (1 shl 6)
+
+	

boot/loader/video.inc

@@ -1,3 +1,2 @@
 video_setup:
 	ret
-

docs/img/pmap_bootstrap.mmd

@@ -1,89 +0,0 @@
----
-title: pmap_bootstrap
----
-flowchart TD
-
-R_BEGIN("Begin")
-R_GETMMAP["Get Memory Map entry"]
-R_MMAP_LAST{"Last Item ?"}
-R_END("End")
-
-subgraph "entry to pmap_block"
-    C_BEGIN("Begin Proc")
-    C_IS_FREE{"Is
-    entry free?"}
-    C_END("End Proc")
-    C_OVERLAP_KERNEL{"entry
-    overlap
-    kernel?"}
-    C_REMOVE_KRESERVED["Remove Kernel
-    Memory from entry"]
-    C_MEMORY_SIZE_EXCEED{"Is entry size
-    larger than
-    0x0x7f80000 ?"}
-    C_MEMORY_SPLIT["Split entry"]
-    C_MEMORY_LAST["Is last ?"]
-
-    C_BEGIN-->C_IS_FREE
-    C_IS_FREE--No-->C_END
-    C_IS_FREE--Yes-->C_OVERLAP_KERNEL
-    C_OVERLAP_KERNEL--Yes-->C_REMOVE_KRESERVED
-    C_REMOVE_KRESERVED-->C_MEMORY_SIZE_EXCEED
-    C_OVERLAP_KERNEL--No-->C_MEMORY_SIZE_EXCEED
-    C_MEMORY_SIZE_EXCEED--Yes-->C_MEMORY_SPLIT
-    C_MEMORY_SPLIT-->C_MEMORY_LAST
-    C_MEMORY_LAST--Yes-->C_END
-
-end
-
-subgraph "create & store pmap_block"
-    D_BEGIN("Begin Proc")
-    D_BOOSTRAP_EXIST{"Bootstrap
-    pmap_block
-    exist?"}
-    D_SETUP_BOOTSTRAP["Setup bootstrap pmap"]
-    D_END("End Proc")
-    D_SET_HEAD_BOOTSTRAP["Set bootstrap as Head"]
-    D_SEARCH_FREE_PAGE["Search free page in Head->bitmap"]
-    D_FREE_PAGE_FOUND{"Free Page found ?"}
-    D_HEAD_NEXT_NULL{"Head->next == NULL?"}
-    D_HEAD_NEXT["Set Head to Head->next"]
-    D_CREATE_PMAP["Create new pmap_block
-    in free page"]
-    D_APPEND_PMAP["Append pmap_block
-    at end of
-    linked list"]
-
-    D_BEGIN-->D_BOOSTRAP_EXIST
-    D_BOOSTRAP_EXIST--No-->D_SETUP_BOOTSTRAP
-    D_SETUP_BOOTSTRAP-->D_END
-    D_BOOSTRAP_EXIST--Yes-->D_SET_HEAD_BOOTSTRAP
-    D_SET_HEAD_BOOTSTRAP-->D_SEARCH_FREE_PAGE
-    D_SEARCH_FREE_PAGE-->D_FREE_PAGE_FOUND
-    D_FREE_PAGE_FOUND--No-->D_HEAD_NEXT_NULL
-    D_HEAD_NEXT_NULL--No-->D_HEAD_NEXT
-    D_HEAD_NEXT-->D_SEARCH_FREE_PAGE
-    D_FREE_PAGE_FOUND--Yes-->D_CREATE_PMAP
-    D_CREATE_PMAP-->D_APPEND_PMAP
-    D_APPEND_PMAP-->D_END
-end
-
-R_BEGIN-->R_GETMMAP
-R_GETMMAP-->R_MMAP_LAST
-R_MMAP_LAST--Yes-->R_END
-
-R_MMAP_LAST--No-->C_BEGIN
-C_MEMORY_SIZE_EXCEED--No-->D_BEGIN
-D_END--Try get next-->C_MEMORY_LAST
-C_MEMORY_LAST--No-->D_BEGIN
-C_END--Try get next entry-->R_MMAP_LAST
-
-
-style R_BEGIN fill:#6CA300
-style R_END fill:#A30000
-
-style C_BEGIN fill:#6CA300
-style C_END fill:#A30000
-
-style D_BEGIN fill:#6CA300
-style D_END fill:#A30000