From 37db7181daf1cc10683de24f6203e595b2ac49bc Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Fri, 29 Jan 2010 20:23:53 +0100
Subject: Copy multiboot information.

---
 kernel/entry.c     | 32 ++++++++++++++++++++++++++++----
 kernel/kernel.ld   |  6 +++++-
 kernel/main.c      |  9 ++++++++-
 kernel/multiboot.h |  8 +++++---
 4 files changed, 46 insertions(+), 9 deletions(-)

diff --git a/kernel/entry.c b/kernel/entry.c
index 61ac82b..28bdb12 100644
--- a/kernel/entry.c
+++ b/kernel/entry.c
@@ -8,6 +8,7 @@ extern void addr_load_virt;
 extern void addr_load_virt_end;
 
 extern void entry_stack;
+extern void entry_multiboot;
 
 extern uint32_t entry_pagedir[];
 extern uint32_t entry_pagetable_low[];
@@ -26,8 +27,9 @@ asm(
 
 void entry_serial_out(char* str);
 void entry_serial_out_hex(uint32_t x);
+void entry_copy_multiboot(multiboot_info_t* mb_info);
 
-void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
+void entry_main(uint32_t mb_magic, multiboot_info_t* mb_info) {
 	entry_serial_out("entry_main()\n");
 	if(mb_magic != 0x2badb002) {
 		entry_serial_out("Multiboot magic word is wrong!\n");
@@ -35,8 +37,9 @@ void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
 	}
 	entry_serial_out("Multiboot ok\n");
 	
-	// TODO: Copy multiboot information.
+	entry_copy_multiboot(mb_info);
 	
+	/*
 	entry_serial_out("Flags: ");
 	entry_serial_out_hex(mb_info->flags);
 	
@@ -49,6 +52,7 @@ void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
 	
 	entry_serial_out("Module addr: ");
 	entry_serial_out_hex(mb_info->mods_addr->mod_start);
+	*/
 	
 	// Create initial page tables.
 	for(unsigned int i = 0; i < 1024; i++) {
@@ -67,6 +71,8 @@ void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
 		}
 	}
 	
+	entry_pagetable_high[((uint32_t)&multiboot_info & 0x003ff000) >> 12] = (uint32_t)&entry_multiboot | 0x003;
+	
 	entry_pagedir[(uint32_t)&addr_phys >> 22] = (uint32_t)&entry_pagetable_low | 0x007;
 	entry_pagedir[(uint32_t)&addr_virt >> 22] = (uint32_t)&entry_pagetable_high | 0x003;
 	
@@ -80,7 +86,7 @@ void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
 		"mov %%cr0, %0\n"
 		"or $0x80000000, %0\n"
 		"mov %0, %%cr0\n"
-		: : "r" (&entry_pagedir) : "%0"
+		:: "r" (&entry_pagedir) : "%0"
 	);
 	
 	// TODO: Check that segments are loaded and mapped right.
@@ -98,7 +104,25 @@ void entry_main(uint32_t mb_magic, multiboot_info* mb_info) {
 	while(1);
 }
 
-#define outb(port, value) asm volatile("out %b0,%w1" : : "a" (value), "d" (port));
+#define memcpy(source, target, size) asm volatile( \
+	"cld\n" \
+	"rep movsd\n" \
+	:: "S" (source), "D" (target), "c" (size / 4) \
+	: "flags", "memory")
+
+void entry_copy_multiboot(multiboot_info_t* mb_info) {
+	// Copy multiboot structure.
+	memcpy(mb_info, &entry_multiboot, sizeof(multiboot_info_t));
+	uint32_t low_p = (uint32_t)&entry_multiboot + sizeof(multiboot_info_t);
+	uint32_t high_p = (uint32_t)&multiboot_info + sizeof(multiboot_info_t);
+	// Copy module structures.
+	memcpy(mb_info->mods_addr, low_p, mb_info->mods_count * sizeof(multiboot_module_t));
+	multiboot_info.mods_addr = (multiboot_module_t*)high_p;
+	low_p += mb_info->mods_count * sizeof(multiboot_module_t);
+	high_p += mb_info->mods_count * sizeof(multiboot_module_t);
+}
+
+#define outb(port, value) asm volatile("out %b0,%w1" : : "a" (value), "d" (port))
 
 void entry_serial_out(char* str) {
 	while(*str) {
diff --git a/kernel/kernel.ld b/kernel/kernel.ld
index ab294ee..28f63c7 100644
--- a/kernel/kernel.ld
+++ b/kernel/kernel.ld
@@ -30,7 +30,8 @@ SECTIONS {
 		entry_pagetable_low = .; . += 0x1000;
 		entry_pagetable_high = .; . += 0x1000;
 		entry_stack = .; . += 0x1000; entry_stack_top = .;
-	
+		entry_multiboot = .; . += 0x1000;
+		
 		kernel/entry.o(.bss)
 	}
 	
@@ -55,4 +56,7 @@ SECTIONS {
 		*(COMMON)
 	}
 	
+	. = ALIGN(0x1000);
+	multiboot_info = .; . += 0x1000;
+	
 }
diff --git a/kernel/main.c b/kernel/main.c
index 93647f5..5cc94d3 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -2,6 +2,7 @@
 #include "gdt.h"
 #include "idt.h"
 #include "irq.h"
+#include "multiboot.h"
 
 void main() {
 	printf("main()\n");
@@ -15,6 +16,11 @@ void main() {
 	irq_init();
 	printf("IRQs set.\n");
 	
+	printf("Multiboot flags: %08x\n", multiboot_info.flags);
+	for(int i = 0; i < multiboot_info.mods_count; i++) {
+		printf("Module %u: %08x %08x %s\n", i, multiboot_info.mods_addr[0].mod_start, multiboot_info.mods_addr[0].mod_end, multiboot_info.mods_addr[0].string);
+	}
+	
 	asm volatile("sti");
 	
 	asm volatile(
@@ -22,8 +28,9 @@ void main() {
 		"push $entry_stack_top\n"
 		"pushf\n"
 		"push $0x1b\n"
-		"push $0x0010a000\n"
+		"push %0\n"
 		"iret\n"
+		:: "r" (multiboot_info.mods_addr[0].mod_start)
 	);
 	
 	printf("Halting.\n");
diff --git a/kernel/multiboot.h b/kernel/multiboot.h
index 93a5c30..ffc3d25 100644
--- a/kernel/multiboot.h
+++ b/kernel/multiboot.h
@@ -8,7 +8,7 @@ typedef struct {
 	uint32_t mod_end;
 	char* string;
 	uint32_t reserved;
-} multiboot_module;
+} multiboot_module_t;
 
 typedef struct {
 	uint32_t flags;
@@ -21,7 +21,7 @@ typedef struct {
 	char* cmdline;
 	
 	uint32_t mods_count;
-	multiboot_module* mods_addr;
+	multiboot_module_t* mods_addr;
 	
 	union {
 		uint32_t foo[3];
@@ -45,6 +45,8 @@ typedef struct {
 	uint32_t vbe_interface_seg;
 	uint32_t vbe_interface_off;
 	uint32_t vbe_interface_len;
-} multiboot_info;
+} multiboot_info_t;
+
+extern multiboot_info_t multiboot_info;
 
 #endif
-- 
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