diff options
Diffstat (limited to 'monitor.S')
| -rw-r--r-- | monitor.S | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/monitor.S b/monitor.S deleted file mode 100644 index dea8551..0000000 --- a/monitor.S +++ /dev/null @@ -1,95 +0,0 @@ -/* - * monitor.S - simple monitor code to switch to NS state before executing kernel - * - * Copyright (C) 2011 Columbia University. All rights reserved. - * Christoffer Dall <cdall@cs.columbia.edu> - * - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE.txt file. - */ - -#.syntax unified - .section monitor, "x" - - .word 0 - .word 0 - b 1f - .word 0 - .word 0 - .word 0 - .word 0 - .word 0 - - @ - @ Secure Monitor Call - @ -1: - ldr sp, =_monitor_stack - push {r10-r12} - - cmp r7, #0xffffffff - beq _non_sec - - @ Check smc number and VMID - bic r12, r7, #0xf - cmp r12, #0xfffffff0 - movnes pc, lr - and r12, r7, #0xf - cmp r12, #0x0 - popgt {r10-r12} - movgts pc, lr - - @ Check the VMID is 0 - mrc p15, 0, r10, c1, c1, 0 @ SCR - orr r11, r10, #1 @ SCR.NS = 1 - mcr p15, 0, r11, c1, c1, 0 - isb - mrrc p15, 6, r12, r11, c2 - mcr p15, 0, r10, c1, c1, 0 @ Restore SCR - lsr r11, r11, #16 - and r11, r11, #0xff - cmp r11, #0 - popne {r10-r12} - movnes pc, lr - - @ Jump to the right function - and r12, r7, #0xf - adr r11, _hyp_funcs - add r11, r11, r12, lsl #2 - ldr pc, [r11] - - @ - @ Jump table for the SMC hypervisor API calls - @ -_hyp_funcs: - .long _write_hvbar - - @ - @ Switch to non-secure mode - @ -_non_sec: - mrc p15, 0, r12, c1, c1, 0 @ Secure configuration register - bic r12, r12, #0x07f - ldr r11, =0x131 - orr r12, r12, r11 - mcr p15, 0, r12, c1, c1, 0 - pop {r10-r12} - movs pc, lr - - @ - @ Read/Write HVBAR - @ -_write_hvbar: - orr r11, r10, #1 @ SCR.NS = 1 (r10 already = SCR) - mcr p15, 0, r11, c1, c1, 0 - isb - mcr p15, 4, r0, c12, c0, 0 - mcr p15, 0, r10, c1, c1, 0 @ Restore SCR - pop {r10-r12} - movs pc, lr - - .ltorg - - /* A bit of stack space for monitor mode */ - .align 12 -_monitor_stack: |