1 files changed, 272 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
new file mode 100644
index 000000000000..0aa73d414783
--- /dev/null
+++ b/arch/arm/mm/proc-v6.S
@@ -0,0 +1,272 @@
+/*
+ *  linux/arch/arm/mm/proc-v6.S
+ *
+ *  Copyright (C) 2001 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  This is the "shell" of the ARMv6 processor support.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/constants.h>
+#include <asm/procinfo.h>
+#include <asm/pgtable.h>
+
+#include "proc-macros.S"
+
+#define D_CACHE_LINE_SIZE       32
+
+        .macro  cpsie, flags
+        .ifc \flags, f
+        .long   0xf1080040
+        .exitm
+        .endif
+        .ifc \flags, i
+        .long   0xf1080080
+        .exitm
+        .endif
+        .ifc \flags, if
+        .long   0xf10800c0
+        .exitm
+        .endif
+        .err
+        .endm
+
+        .macro  cpsid, flags
+        .ifc \flags, f
+        .long   0xf10c0040
+        .exitm
+        .endif
+        .ifc \flags, i
+        .long   0xf10c0080
+        .exitm
+        .endif
+        .ifc \flags, if
+        .long   0xf10c00c0
+        .exitm
+        .endif
+        .err
+        .endm
+
+ENTRY(cpu_v6_proc_init)
+        mov     pc, lr
+
+ENTRY(cpu_v6_proc_fin)
+        mov     pc, lr
+
+/*
+ *      cpu_v6_reset(loc)
+ *
+ *      Perform a soft reset of the system.  Put the CPU into the
+ *      same state as it would be if it had been reset, and branch
+ *      to what would be the reset vector.
+ *
+ *      - loc   - location to jump to for soft reset
+ *
+ *      It is assumed that:
+ */
+        .align  5
+ENTRY(cpu_v6_reset)
+        mov     pc, r0
+
+/*
+ *      cpu_v6_do_idle()
+ *
+ *      Idle the processor (eg, wait for interrupt).
+ *
+ *      IRQs are already disabled.
+ */
+ENTRY(cpu_v6_do_idle)
+        mcr     p15, 0, r1, c7, c0, 4           @ wait for interrupt
+        mov     pc, lr
+
+ENTRY(cpu_v6_dcache_clean_area)
+#ifndef TLB_CAN_READ_FROM_L1_CACHE
+1:      mcr     p15, 0, r0, c7, c10, 1          @ clean D entry
+        add     r0, r0, #D_CACHE_LINE_SIZE
+        subs    r1, r1, #D_CACHE_LINE_SIZE
+        bhi     1b
+#endif
+        mov     pc, lr
+
+/*
+ *      cpu_arm926_switch_mm(pgd_phys, tsk)
+ *
+ *      Set the translation table base pointer to be pgd_phys
+ *
+ *      - pgd_phys - physical address of new TTB
+ *
+ *      It is assumed that:
+ *      - we are not using split page tables
+ */
+ENTRY(cpu_v6_switch_mm)
+        mov     r2, #0
+        ldr     r1, [r1, #MM_CONTEXT_ID]        @ get mm->context.id
+        mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
+        mcr     p15, 0, r2, c7, c10, 4          @ drain write buffer
+        mcr     p15, 0, r0, c2, c0, 0           @ set TTB 0
+        mcr     p15, 0, r1, c13, c0, 1          @ set context ID
+        mov     pc, lr
+
+#define nG      (1 << 11)
+#define APX     (1 << 9)
+#define AP1     (1 << 5)
+#define AP0     (1 << 4)
+#define XN      (1 << 0)
+
+/*
+ *      cpu_v6_set_pte(ptep, pte)
+ *
+ *      Set a level 2 translation table entry.
+ *
+ *      - ptep  - pointer to level 2 translation table entry
+ *                (hardware version is stored at -1024 bytes)
+ *      - pte   - PTE value to store
+ *
+ *      Permissions:
+ *        YUWD  APX AP1 AP0     SVC     User
+ *        0xxx   0   0   0      no acc  no acc
+ *        100x   1   0   1      r/o     no acc
+ *        10x0   1   0   1      r/o     no acc
+ *        1011   0   0   1      r/w     no acc
+ *        110x   1   1   0      r/o     r/o
+ *        11x0   1   1   0      r/o     r/o
+ *        1111   0   1   1      r/w     r/w
+ */
+ENTRY(cpu_v6_set_pte)
+        str     r1, [r0], #-2048                @ linux version
+
+        bic     r2, r1, #0x00000ff0
+        bic     r2, r2, #0x00000003
+        orr     r2, r2, #AP0 | 2
+
+        tst     r1, #L_PTE_WRITE
+        tstne   r1, #L_PTE_DIRTY
+        orreq   r2, r2, #APX
+
+        tst     r1, #L_PTE_USER
+        orrne   r2, r2, #AP1 | nG
+        tstne   r2, #APX
+        eorne   r2, r2, #AP0
+
+        tst     r1, #L_PTE_YOUNG
+        biceq   r2, r2, #APX | AP1 | AP0
+
+@       tst     r1, #L_PTE_EXEC
+@       orreq   r2, r2, #XN
+
+        tst     r1, #L_PTE_PRESENT
+        moveq   r2, #0
+
+        str     r2, [r0]
+        mcr     p15, 0, r0, c7, c10, 1 @ flush_pte
+        mov     pc, lr
+
+
+
+
+cpu_v6_name:
+        .asciz  "Some Random V6 Processor"
+        .align
+
+        .section ".text.init", #alloc, #execinstr
+
+/*
+ *      __v6_setup
+ *
+ *      Initialise TLB, Caches, and MMU state ready to switch the MMU
+ *      on.  Return in r0 the new CP15 C1 control register setting.
+ *
+ *      We automatically detect if we have a Harvard cache, and use the
+ *      Harvard cache control instructions insead of the unified cache
+ *      control instructions.
+ *
+ *      This should be able to cover all ARMv6 cores.
+ *
+ *      It is assumed that:
+ *      - cache type register is implemented
+ */
+__v6_setup:
+        mov     r0, #0
+        mcr     p15, 0, r0, c7, c14, 0          @ clean+invalidate D cache
+        mcr     p15, 0, r0, c7, c5, 0           @ invalidate I cache
+        mcr     p15, 0, r0, c7, c15, 0          @ clean+invalidate cache
+        mcr     p15, 0, r0, c7, c10, 4          @ drain write buffer
+        mcr     p15, 0, r0, c8, c7, 0           @ invalidate I + D TLBs
+        mcr     p15, 0, r0, c2, c0, 2           @ TTB control register
+        mcr     p15, 0, r4, c2, c0, 1           @ load TTB1
+#ifdef CONFIG_VFP
+        mrc     p15, 0, r0, c1, c0, 2
+        orr     r0, r0, #(3 << 20)
+        mcr     p15, 0, r0, c1, c0, 2           @ Enable full access to VFP
+#endif
+        mrc     p15, 0, r0, c1, c0, 0           @ read control register
+        ldr     r5, v6_cr1_clear                @ get mask for bits to clear
+        bic     r0, r0, r5                      @ clear bits them
+        ldr     r5, v6_cr1_set                  @ get mask for bits to set
+        orr     r0, r0, r5                      @ set them
+        mov     pc, lr                          @ return to head.S:__ret
+
+        /*
+         *         V X F   I D LR
+         * .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM
+         * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
+         *         0 110       0011 1.00 .111 1101 < we want
+         */
+        .type   v6_cr1_clear, #object
+        .type   v6_cr1_set, #object
+v6_cr1_clear:
+        .word   0x01e0fb7f
+v6_cr1_set:
+        .word   0x00c0387d
+
+        .type   v6_processor_functions, #object
+ENTRY(v6_processor_functions)
+        .word   v6_early_abort
+        .word   cpu_v6_proc_init
+        .word   cpu_v6_proc_fin
+        .word   cpu_v6_reset
+        .word   cpu_v6_do_idle
+        .word   cpu_v6_dcache_clean_area
+        .word   cpu_v6_switch_mm
+        .word   cpu_v6_set_pte
+        .size   v6_processor_functions, . - v6_processor_functions
+
+        .type   cpu_arch_name, #object
+cpu_arch_name:
+        .asciz  "armv6"
+        .size   cpu_arch_name, . - cpu_arch_name
+
+        .type   cpu_elf_name, #object
+cpu_elf_name:
+        .asciz  "v6"
+        .size   cpu_elf_name, . - cpu_elf_name
+        .align
+
+        .section ".proc.info", #alloc, #execinstr
+
+        /*
+         * Match any ARMv6 processor core.
+         */
+        .type   __v6_proc_info, #object
+__v6_proc_info:
+        .long   0x0007b000
+        .long   0x0007f000
+        .long   PMD_TYPE_SECT | \
+                PMD_SECT_BUFFERABLE | \
+                PMD_SECT_CACHEABLE | \
+                PMD_SECT_AP_WRITE | \
+                PMD_SECT_AP_READ
+        b       __v6_setup
+        .long   cpu_arch_name
+        .long   cpu_elf_name
+        .long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_VFP|HWCAP_EDSP|HWCAP_JAVA
+        .long   cpu_v6_name
+        .long   v6_processor_functions
+        .long   v6wbi_tlb_fns
+        .long   v6_user_fns
+        .long   v6_cache_fns
+        .size   __v6_proc_info, . - __v6_proc_info