WebSVN – HelenOS – Diff – /branches/rcu/kernel/arch/ia32/src/boot/boot.S

 	movw %cx, %ss
 	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
 	multiboot_meeting_point:
-	pushl %ebx							# save parameters from GRUB
+	movl %eax, grub_eax					# save parameters from GRUB
+	movl %ebx, grub_ebx
-	pushl %eax
+	xorl %eax, %eax
+ 	cpuid
+ 	cmp $0x0, %eax						# any function > 0?
+	jbe pse_unsupported
+	movl $0x1, %eax						# Basic function code 1
+	cpuid
+	bt $3, %edx							# Test if PSE is supported
+	jc pse_supported
+	pse_unsupported:
+		movl $pse_msg, %esi
+		jmp error_halt
+	pse_supported:
 #ifdef CONFIG_FB
 	mov $vesa_init, %esi
 	mov $VESA_INIT_SEGMENT << 4, %edi
 	mov $e_vesa_init - vesa_init, %ecx
 	mov %bx, KA2PA(vesa_bpp)
 #endif
 	call map_kernel							# map kernel and turn paging on
-	popl %eax
+	movl grub_eax, %eax
-	popl %ebx
+	movl grub_ebx, %ebx
 	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
 	je valid_boot
 		xorl %ecx, %ecx							# no memory size or map available
 		movl %ecx, e801memorysize
 	movl $_hardcoded_unmapped_size, %ecx
 	cld
 	rep movsb
 #endif
 	call main_bsp								# never returns
 	cli
 	hlt
+	#
 	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
 	# For simplicity, we map the entire 4G space.
+	#
 	movl %cr4, %ecx
-	orl $(1<<4), %ecx
+	orl $(1 << 4), %ecx							# turn PSE on
-	movl %ecx, %cr4							# turn PSE on
+	andl $(~(1 << 5)), %ecx						# turn PAE off
+	movl %ecx, %cr4
-	movl $(page_directory+0), %esi
+	movl $(page_directory + 0), %esi
-	movl $(page_directory+2048), %edi
+	movl $(page_directory + 2048), %edi
 	xorl %ecx, %ecx
 	xorl %ebx, %ebx
 :
-	movl $((1<<7)|(1<<0)), %eax
+	movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax
 	orl %ebx, %eax
-	movl %eax, (%esi,%ecx,4)					# mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M
+	movl %eax, (%esi, %ecx, 4)					# mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
-	movl %eax, (%edi,%ecx,4)					# mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M
+	movl %eax, (%edi, %ecx, 4)					# mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
-	addl $(4*1024*1024), %ebx
+	addl $(4 * 1024 * 1024), %ebx
 	incl %ecx
 	cmpl $512, %ecx
 	jl 0b
 	movl %esi, %cr3
-	# turn paging on
 	movl %cr0, %ebx
-	orl $(1<<31), %ebx
+	orl $(1 << 31), %ebx						# turn paging on
 	movl %ebx, %cr0
 	ret
+# Print string from %esi to EGA display (in red) and halt
+error_halt:
+	movl $0xb8000, %edi						# base of EGA text mode memory
+	xorl %eax, %eax
+	movw $0x3d4, %dx						# read bits 8 - 15 of the cursor address
+	movb $0xe, %al
+	outb %al, %dx
+	movw $0x3d5, %dx
+	inb %dx, %al
+	shl $8, %ax
+	movw $0x3d4, %dx						# read bits 0 - 7 of the cursor address
+	movb $0xf, %al
+	outb %al, %dx
+	movw $0x3d5, %dx
+	inb %dx, %al
+	cmp $1920, %ax
+	jbe cursor_ok
+		movw $1920, %ax						# sanity check for the cursor on the last line
+	cursor_ok:
+	movw %ax, %bx
+	shl $1, %eax
+	addl %eax, %edi
+	movw $0x0c00, %ax						# black background, light red foreground
+	cld
+	ploop:
+		lodsb
+		cmp $0, %al
+		je ploop_end
+		stosw
+		inc %bx
+		jmp ploop
+	ploop_end:
+	movw $0x3d4, %dx						# write bits 8 - 15 of the cursor address
+	movb $0xe, %al
+	outb %al, %dx
+	movw $0x3d5, %dx
+	movb %bh, %al
+	outb %al, %dx
+	movw $0x3d4, %dx						# write bits 0 - 7 of the cursor address
+	movb $0xf, %al
+	outb %al, %dx
+	movw $0x3d5, %dx
+	movb %bl, %al
+	outb %al, %dx
+	cli
+	hlt
 #ifdef CONFIG_FB
 vesa_init:
 	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
 .code16
 	movl $0x0000fffc, %ebp
 	pushl %eax
 #define VESA_INFO_SIZE 1024
+#define VESA_MODE_ATTRIBUTES_OFFSET 0
 #define VESA_MODE_LIST_PTR_OFFSET 14
+#define VESA_MODE_SCANLINE_OFFSET 16
 #define VESA_MODE_WIDTH_OFFSET 18
 #define VESA_MODE_HEIGHT_OFFSET 20
 #define VESA_MODE_BPP_OFFSET 25
-#define VESA_MODE_SCANLINE_OFFSET 16
 #define VESA_MODE_PHADDR_OFFSET 40
 #define VESA_END_OF_MODES 0xffff
 #define VESA_OK 0x4f
 #define VESA_GET_INFO 0x4f00
 #define VESA_GET_MODE_INFO 0x4f01
 #define VESA_SET_MODE 0x4f02
-#define CONFIG_VESA_BPP_a 255
+#define VESA_SET_PALETTE 0x4f09
 #if CONFIG_VESA_BPP == 24
-#undef CONFIG_VESA_BPP_a
-#define CONFIG_VESA_BPP_a 32
+#define CONFIG_VESA_BPP_VARIANT 32
 #endif
 	mov $VESA_GET_INFO, %ax
 	mov $e_vesa_init - vesa_init, %di
 	push %di
 	mov $CONFIG_VESA_WIDTH, %ax
 	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
 	jnz 1b
-	mov $CONFIG_VESA_HEIGHT,%ax
+	mov $CONFIG_VESA_HEIGHT, %ax
 	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
 	jnz 1b
 	mov $CONFIG_VESA_BPP, %al
 	cmp VESA_MODE_BPP_OFFSET(%di), %al
+#ifdef CONFIG_VESA_BPP_VARIANT
 	jz 2f
-	mov $CONFIG_VESA_BPP_a, %al
+	mov $CONFIG_VESA_BPP_VARIANT, %al
 	cmp VESA_MODE_BPP_OFFSET(%di), %al
+#endif
 	jnz 1b
 :
 	mov %cx, %bx
 	or $0xc000, %bx
 	push %di
 	int $0x10
 	pop %di
 	cmp $VESA_OK, %al
 	jnz 0f
+#if CONFIG_VESA_BPP == 8
+	# Set 3:2:3 VGA palette
+	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
+	push %di
+	mov $vga323 - vesa_init, %di
+	mov $0x100, %ecx
+	bt $5, %ax							# Test if VGA compatible registers are present
+	jnc vga_compat
+		# Try VESA routine to set palette
+		mov $VESA_SET_PALETTE, %ax
+		xor %bl, %bl
+		xor %dx, %dx
+		int $0x10
+		jmp vga_not_compat
+	vga_compat:
+		# Try VGA registers to set palette
+		movw $0x3c6, %dx						# Set palette mask
+		movb $0xff, %al
+		outb %al, %dx
+		movw $0x3c8, %dx						# First index to set
+		xor %al, %al
+		outb %al, %dx
+		movw $0x3c9, %dx						# Data port
+		vga_loop:
+			movb %es:2(%di), %al
+			outb %al, %dx
+			movb %es:1(%di), %al
+			outb %al, %dx
+			movb %es:(%di), %al
+			outb %al, %dx
+			addw $4, %di
+			loop vga_loop
+	vga_not_compat:
+	pop %di
+#endif
 	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
 	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
 	shl $16, %eax
 	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
 	mov $0x0003, %ax
 	int $0x10
 	mov $0xffffffff, %edi		# EGA text mode used, because of problems with VESA
 	xor %ax, %ax
 	jz 8b						# Force relative jump
+vga323:
+#include "vga323.pal"
 .code32
 vesa_init_protect:
-	popl %esp
 	movw $selector(KDATA_DES), %cx
 	movw %cx, %es
 	movw %cx, %fs
 	movw %cx, %gs
 	movw %cx, %ds					# kernel data + stack
 	movw %cx, %ss
+	movl $START_STACK, %esp			# initialize stack pointer
 	jmpl $selector(KTEXT_DES), $vesa_meeting_point
 .align 4
 e_vesa_init:
 #endif
 .section K_DATA_START, "aw", @progbits
 .align 4096
 page_directory:
 	.space 4096, 0
+grub_eax:
+	.long 0
+grub_ebx:
+	.long 0
+pse_msg:
+	.asciz "Page Size Extension not supported. System halted."

Subversion Repositories HelenOS

(root)/branches/rcu/kernel/arch/ia32/src/boot/boot.S @ 2497 – Rev 2131 → 2307