2 #include "include/assembly.h"
3 #include "include/options.h"
6 @ Exception defs taken from ARM DDI 0406B
9 interrupt_vector_table:
10 ivt_reset: b _start @ Reset
12 ivt_svc: b SVC_Handler @ SVC (used to be called SWI)
13 ivt_prefetch: b PrefetchAbort @ Prefetch abort
14 ivt_data: b DataAbort @ Data abort
15 ivt_unused: b . @ Not Used
16 ivt_irq: b IRQHandler @ IRQ
17 ivt_fiq: b . @ FIQ (Fast interrupt)
21 ldr r0, =kernel_table0-KERNEL_BASE
22 mcr p15, 0, r0, c2, c0, 1 @ Set TTBR1 to r0
23 mcr p15, 0, r0, c2, c0, 0 @ Set TTBR0 to r0 too (for identity)
26 mcr p15, 0, r0, c2, c0, 2 @ Set TTCR to 1 (50/50 split)
29 mcr p15, 0, r0, c3, c0, 0 @ Set Domain 0 to Manager
32 mrc p15, 0, r0, c1, c0, 0
35 mcr p15, 0, r0, c1, c0, 0
38 @ Check for security extensions
40 mrc p15, 0, r0, c0, c1, 1
44 mcrne p15, 0, r0, c12, c0, 0 @ Set the VBAR (brings exceptions into high memory)
46 mrceq p15, 0, r0, c1, c0, 0 @ Set SCTLR.V
48 mcreq p15, 0, r0, c1, c0, 0
51 @ Prepare for interrupts
53 ldr sp, =irqstack+0x1000 @ Set up stack
55 ldr sp, =abortstack+0x1000
58 ldr sp, =0x80000000-4 @ Set up stack (top of user range)
61 1: b 1b @ Infinite loop
65 .comm irqstack, 0x1000 @ ; 4KiB Stack
66 .comm abortstack, 0x1000 @ ; 4KiB Stack
68 .extern SyscallHandler
71 srsdb sp!, #19 @ Save state to stack
72 cpsie ifa, #19 @ Ensure we're in supervisor with interrupts enabled (should already be there)
85 ldr r4, =SyscallHandler
89 pop {r0,r1} @ Ret/RetHi
90 add sp, #2*4 @ Saved r2/r3
93 rfeia sp! @ Pop state (actually RFEFD)
97 mov r1, sp @ Arguments
99 ldr r4, =ARMv7_int_HandleSyscalls
108 gpIRQHandler: .long 0
109 IRQ_saved_sp: .long 0
110 IRQ_saved_lr: .long 0
113 sub lr, #4 @ Adjust LR to the correct value
114 srsdb sp!, #19 @ Switch to supervisor mode (DDI0406B D1.6.5) (actually SRSFD)
124 @ Call the registered handler
131 rfeia sp! @ Pop state (actually RFEFD)
136 sub lr, #8 @ Adjust LR to the correct value
137 @ srsdb sp!, #19 @ Switch to supervisor mode (DDI0406B D1.6.5) (actually SRSFD)
141 mrc p15, 0, r4, c5, c0, 0 @ Read DFSR (Data Fault Address Register) to stack
143 mrc p15, 0, r3, c6, c0, 0 @ Read DFAR (Data Fault Address Register) into R3
145 ldr r1, =csDataAbort_Fmt
152 @ rfeia sp! @ Pop state (actually RFEFD)
156 sub lr, #4 @ Adjust LR to the correct value
157 @ srsdb sp!, #19 @ Switch to supervisor mode (DDI0406B D1.6.5) (actually SRSFD)
162 ldr r1, =csPrefetchAbort_Fmt
164 mrc p15, 0, r3, c5, c0, 0 @ Read IFSR (Instruction Fault Address Register) into R3
176 .asciz "Data Abort - %p accessed %p, DFSR=%x Unk:%x Unk:%x"
178 .asciz "Prefetch Abort at %p, IFSR=%x"
184 .long 0x00000002 @ Identity map the first 1 MiB
188 .long user_table1_map + 0x000 - KERNEL_BASE + 1 @ 0x7FC00000
189 .long user_table1_map + 0x400 - KERNEL_BASE + 1 @ 0x7FD00000
190 .long user_table1_map + 0x800 - KERNEL_BASE + 1 @ KStacks
191 .long user_table1_map + 0xC00 - KERNEL_BASE + 1
192 @ 0x80000000 - User/Kernel split
193 .long 0x00000002 @ Map first 4 MiB to 2GiB
197 .rept 0xF00 - 0x800 - 4
201 .long PCI_PADDR + 0*(1 << 20) + 2 @ Map PCI config space
202 .long PCI_PADDR + 1*(1 << 20) + 2
203 .long PCI_PADDR + 2*(1 << 20) + 2
204 .long PCI_PADDR + 3*(1 << 20) + 2
205 .long PCI_PADDR + 4*(1 << 20) + 2
206 .long PCI_PADDR + 5*(1 << 20) + 2
207 .long PCI_PADDR + 6*(1 << 20) + 2
208 .long PCI_PADDR + 7*(1 << 20) + 2
209 .long PCI_PADDR + 8*(1 << 20) + 2
210 .long PCI_PADDR + 9*(1 << 20) + 2
211 .long PCI_PADDR + 10*(1 << 20) + 2
212 .long PCI_PADDR + 11*(1 << 20) + 2
213 .long PCI_PADDR + 12*(1 << 20) + 2
214 .long PCI_PADDR + 13*(1 << 20) + 2
215 .long PCI_PADDR + 14*(1 << 20) + 2
216 .long PCI_PADDR + 15*(1 << 20) + 2
222 .long hwmap_table_0 + 0x000 - KERNEL_BASE + 1
223 .long hwmap_table_0 + 0x400 - KERNEL_BASE + 1
224 .long hwmap_table_0 + 0x800 - KERNEL_BASE + 1
225 .long hwmap_table_0 + 0xC00 - KERNEL_BASE + 1
226 .rept 0xFF8 - 0xF00 - 16 - 4
230 .long kernel_table1_map + 0x000 - KERNEL_BASE + 1
231 .long kernel_table1_map + 0x400 - KERNEL_BASE + 1
232 .long kernel_table1_map + 0x800 - KERNEL_BASE + 1
233 .long kernel_table1_map + 0xC00 - KERNEL_BASE + 1
234 .long kernel_exception_map + 0x000 - KERNEL_BASE + 1
235 .long kernel_exception_map + 0x400 - KERNEL_BASE + 1
236 .long kernel_exception_map + 0x800 - KERNEL_BASE + 1
237 .long kernel_exception_map + 0xC00 - KERNEL_BASE + 1
240 .globl user_table1_map
241 @ User table1 data table (only the first half is needed)
242 @ - Abused to provide kernel stacks in upper half
243 user_table1_map: @ Size = 4KiB (only 2KiB used)
247 .long user_table1_map - KERNEL_BASE + 0x10 + 3 @ ...1FF000 = 0x7FDFF000
249 .long kernel_table0 + 0x0000 - KERNEL_BASE + 0x10 + 3 @ ...200000 = 0x7FE00000
250 .long kernel_table0 + 0x1000 - KERNEL_BASE + 0x10 + 3 @ ...201000 = 0x7FE01000
251 .rept (0x800/4)-(MM_KSTACK_SIZE/0x1000)-2
254 #if MM_KSTACK_SIZE != 0x2000
255 #error Kernel stack size not changed in start.S
257 .long stack + 0x0000 - KERNEL_BASE + 0x10 + 3 @ Kernel Stack
258 .long stack + 0x1000 - KERNEL_BASE + 0x10 + 3 @
260 .globl kernel_table1_map
261 kernel_table1_map: @ Size = 4KiB
265 .long hwmap_table_0 - KERNEL_BASE + (1 << 4) + 3
266 .rept 0xFF8/4 - (0xF00+16)/4 - 1
269 .long kernel_table1_map - KERNEL_BASE + (1 << 4) + 3
270 .long kernel_exception_map - KERNEL_BASE + 0x13
275 .long UART0_PADDR + (1 << 4) + 3 @ UART0
279 .globl kernel_exception_map
280 kernel_exception_map:
285 @ Align to nearly the end
289 .long 0x213 @ Map first page for exceptions (Kernel RO)
296 .space MM_KSTACK_SIZE, 0 @ Original kernel stack