+KERNEL_BASE = 0x80000000
+
+.section .init
interrupt_vector_table:
- b . @ Reset
+ b _start @ Reset
b .
- b . @ SWI instruction
+ b SyscallHandler @ SWI instruction
b .
b .
b .
b .
b .
-.comm stack, 0x10000 @ ; 64KiB Stack
-
.globl _start
_start:
+ ldr r0, =kernel_table0-KERNEL_BASE
+ mcr p15, 0, r0, c2, c0, 1 @ Set TTBR1 to r0
+ mcr p15, 0, r0, c2, c0, 0 @ Set TTBR0 to r0 too (for identity)
+
+@ mov r0, #1
+@ mcr p15, 0, r0, c2, c0, 2 @ Set TTCR to 1 (50/50 split)
+
+@ mrc p15, 0, r0, c1, c0, 0
+ orr r0, r0, #1
+@ orr r0, r0, #1 << 23
+@ mcr p15, 0, r0, c1, c0, 0
+
ldr sp, =stack+0x10000 @ Set up stack
- bl main
+ ldr r0, =kmain
+ mov pc, r0
1: b 1b @ Infinite loop
+_ptr_kmain:
+ .long kmain
+
+.comm stack, 0x10000 @ ; 64KiB Stack
+
+SyscallHandler:
+ b .
+.section .padata
+.globl kernel_table0
+
+kernel_table0:
+ .long 0x00000002 @ Identity map the first 4 MiB
+ .rept 0x801
+ .long 0
+ .endr
+ .long 0x00000002 @ Identity map the first 4 MiB
+ .long 0x00100002 @
+ .long 0x00200002 @
+ .long 0x00300002 @
+ .rept 0xF00 - 0x800 - 4
+ .long 0
+ .endr
+ .long hwmap_table_0 + 0x000 - KERNEL_BASE + 1
+ .long hwmap_table_0 + 0x400 - KERNEL_BASE + 1
+ .long hwmap_table_0 + 0x800 - KERNEL_BASE + 1
+ .long hwmap_table_0 + 0xC00 - KERNEL_BASE + 1
+ .rept 0xFF8 - 0xF00 - 4
+ .long 0
+ .endr
+ .long kernel_table1_map + 0x000 - KERNEL_BASE + 1
+ .long kernel_table1_map + 0x400 - KERNEL_BASE + 1
+ .long kernel_table1_map + 0x800 - KERNEL_BASE + 1
+ .long kernel_table1_map + 0xC00 - KERNEL_BASE + 1
+ .long kernel_table0 - KERNEL_BASE + 2 @ Sure it maps too much, but fuck that
+ .rept 0x1000 - 0xFF8 - 5
+ .long 0
+ .endr
+
+.globl kernel_table1_map
+kernel_table1_map:
+ .rept 0xF00/4
+ .long 0
+ .endr
+ .long hwmap_table_0 - KERNEL_BASE + (1 << 4) + 3
+ .rept 0xFF8/4 - 0xF00/4 - 1
+ .long 0
+ .endr
+ .long kernel_table1_map - KERNEL_BASE + (1 << 4) + 3
+ .long 0
+.globl hwmap_table_0
+hwmap_table_0:
+ .long 0x16000000 + (1 << 4) + 3 @ Serial Port
+ .rept 1024 - 1
+ .long 0
+ .endr
+