| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/vfp/entry.S |
| 3 | * |
| 4 | * Copyright (C) 2004 ARM Limited. |
| 5 | * Written by Deep Blue Solutions Limited. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * Basic entry code, called from the kernel's undefined instruction trap. |
| 12 | * r0 = faulted instruction |
| 13 | * r5 = faulted PC+4 |
| 14 | * r9 = successful return |
| 15 | * r10 = thread_info structure |
| 16 | * lr = failure return |
| 17 | */ |
| 18 | #include <linux/linkage.h> |
| 19 | #include <linux/init.h> |
| Sam Ravnborg | e6ae744 | 2005-09-09 21:08:59 +0200 | [diff] [blame] | 20 | #include <asm/asm-offsets.h> |
| Russell King | 9c42954 | 2006-03-23 16:59:37 +0000 | [diff] [blame] | 21 | #include <asm/assembler.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/vfpmacros.h> |
| 23 | |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 24 | ENTRY(do_vfp) |
| Russell King | 5d25ac0 | 2006-03-15 12:33:43 +0000 | [diff] [blame] | 25 | enable_irq |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | ldr r4, .LCvfp |
| Catalin Marinas | c642846 | 2007-01-24 18:47:08 +0100 | [diff] [blame] | 27 | ldr r11, [r10, #TI_CPU] @ CPU number |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| 29 | ldr pc, [r4] @ call VFP entry point |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 30 | ENDPROC(do_vfp) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| Russell King | 5d4cae5 | 2007-06-10 12:22:20 +0100 | [diff] [blame] | 32 | ENTRY(vfp_null_entry) |
| 33 | mov pc, lr |
| 34 | ENDPROC(vfp_null_entry) |
| 35 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | .LCvfp: |
| 37 | .word vfp_vector |
| 38 | |
| 39 | @ This code is called if the VFP does not exist. It needs to flag the |
| 40 | @ failure to the VFP initialisation code. |
| 41 | |
| 42 | __INIT |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 43 | ENTRY(vfp_testing_entry) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | ldr r0, VFP_arch_address |
| 45 | str r5, [r0] @ known non-zero value |
| 46 | mov pc, r9 @ we have handled the fault |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 47 | ENDPROC(vfp_testing_entry) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | VFP_arch_address: |
| 50 | .word VFP_arch |
| 51 | |
| 52 | __FINIT |