Changeset 339e053 in mainline

Timestamp:

2005-09-04T09:59:13Z (20 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8ec9bae

Parents:

23f4b1fb

Message:

finish GRUB booting (including memory map and SMP)

Location:

arch/ia32

Files:

• _link.ld (modified) (1 diff)
• src/boot/boot.S (modified) (5 diffs)
• src/boot/memmap.S (modified) (4 diffs)

arch/ia32/_link.ld ¶

@@ -54 +54 @@
         
         _hardcoded_kernel_size = (ktext_end - ktext_start) + (unmapped_ktext_end - unmapped_ktext_start) + (kdata_end - kdata_start) + (unmapped_kdata_end - unmapped_kdata_start);
+        _hardcoded_unmapped_size = (unmapped_ktext_end - unmapped_ktext_start) + (unmapped_kdata_end - unmapped_kdata_start);
         
         _map_address = 0x80100000;

arch/ia32/src/boot/boot.S ¶

@@ -28 +28 @@
 
 #include <arch/boot/boot.h>
+#include <arch/boot/memmapasm.h>
 
 .section K_TEXT_START
@@ -81 +82 @@
         movw %ax, %ss
         
-        call map_kernel                 # map kernel and turn paging on
-        
         movb $0xd1, %al                 # enable A20 using the keyboard controller
         outb %al, $0x64
@@ -93 +92 @@
         cld
         rep movsb
+        
+        call map_kernel                 # map kernel and turn paging on
         
         call main_bsp                   # never returns
@@ -114 +115 @@
         multiboot_meeting_point:
         
-        pushl %ebx
+        pushl %ebx                                                                              # save parameters from GRUB
         pushl %eax
+        
+        movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
+        movl $BOOTSTRAP_OFFSET, %edi
+        movl $_hardcoded_unmapped_size, %ecx
+        cld
+        rep movsb
         
         call map_kernel                                                                 # map kernel and turn paging on
@@ -121 +128 @@
         popl %eax
         popl %ebx
-        cmpl $MULTIBOOT_LOADER_MAGIC, %eax
+        cmpl $MULTIBOOT_LOADER_MAGIC, %eax                      # compare GRUB signature
         je valid_boot
-        
-                # ...
+                
+                xorl %ecx, %ecx                                                 # no memory size or map available
+                movl %ecx, e801memorysize
+                movl %ecx, e820counter
                 
                 jmp invalid_boot
-        
+                
         valid_boot:
                 
-                movl (%ebx), %eax
-                
-                # ... check flags in eax
-                
-                movl 4(%ebx), %ecx
-                addl 8(%ebx), %ecx
+                movl (%ebx), %eax                                               # ebx = physical address of struct multiboot_info
+                
+                bt $0, %eax                                                             # mbi->flags[0] (mem_lower, mem_upper valid)
+                jc mem_valid
+                        
+                        xorl %ecx, %ecx
+                        jmp mem_invalid
+                        
+                mem_valid:
+                movl 4(%ebx), %ecx                                              # mbi->mem_lower
+                addl 8(%ebx), %ecx                                              # mbi->mem_upper
+                
+                mem_invalid:
                 movl %ecx, e801memorysize
                 
-#               movl 44(%ebx), %ecx
-                xorl %ecx, %ecx
-                movl %ecx, e820counter
-#               movl 48(%ebx), %esi
-#               movl $e820table, %edi
-#               cld
-#               rep movsb
+                bt $6, %eax                                                             # mbi->flags[6] (mmap_length, mmap_addr valid)  
+                jc mmap_valid
+                        
+                        xorl %edx, %edx
+                        jmp mmap_invalid
+                        
+                mmap_valid:
+                movl 44(%ebx), %ecx                                             # mbi->mmap_length
+                movl 48(%ebx), %esi                                             # mbi->mmap_addr
+                movl $e820table, %edi
+                xorl %edx, %edx
+                
+                mmap_loop:
+                        cmpl $0, %ecx
+                        jle mmap_end
+                        
+                        movl 4(%esi), %eax                                      # mmap->base_addr_low
+                        movl %eax, (%edi)
+                        
+                        movl 8(%esi), %eax                                      # mmap->base_addr_high
+                        movl %eax, 4(%edi)
+                        
+                        movl 12(%esi), %eax                                     # mmap->length_low
+                        movl %eax, 8(%edi)
+                        
+                        movl 16(%esi), %eax                                     # mmap->length_high
+                        movl %eax, 12(%edi)
+                        
+                        movl 20(%esi), %eax                                     # mmap->type
+                        movl %eax, 16(%edi)
+                        
+                        movl (%esi), %eax                                       # mmap->size
+                        addl $0x4, %eax
+                        addl %eax, %esi
+                        subl %eax, %ecx
+                        addl $MEMMAP_E820_RECORD_SIZE, %edi
+                        incl %edx
+                        jmp mmap_loop
+                
+                mmap_end:
+                
+                mmap_invalid:
+                movl %edx, e820counter
                 
         invalid_boot:

arch/ia32/src/boot/memmap.S ¶

@@ -30 +30 @@
 #include <arch/boot/memmapasm.h>
 
-E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
-E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
 E820_SMAP = 0x534d4150
 
@@ -47 +45 @@
         movw    %bx,%es
         movw    $e820table_boot,%di
-        movb    $E820_MAX_RECORDS,e820counter_boot
+        movb    $MEMMAP_E820_MAX_RECORDS,e820counter_boot
 e820loop:       
         movl    $E820_SMAP,%edx         # control sequence "SMAP"
 
         movl    $0x0000e820,%eax        # service
-        movl    $E820_RECORD_SIZE,%ecx
+        movl    $MEMMAP_E820_RECORD_SIZE,%ecx
         int     $0x15
         jc      e820err
@@ -59 +57 @@
         jne     e820err
 
-        cmpl    $E820_RECORD_SIZE,%ecx
+        cmpl    $MEMMAP_E820_RECORD_SIZE,%ecx
         jne     e820err                 # bad record size - bug in bios
         
         movw    %di,%ax         # next record
-        addw    $E820_RECORD_SIZE,%ax
+        addw    $MEMMAP_E820_RECORD_SIZE,%ax
         movw    %ax,%di
                 
@@ -73 +71 @@
         
 e820end:
-        movb    $E820_MAX_RECORDS,%al
+        movb    $MEMMAP_E820_MAX_RECORDS,%al
         subb    e820counter_boot,%al
         movb    %al,e820counter_boot # store # of valid entries in e820counter