unicore32 core architecture: processor and system headers

This patch includes processor and system headers. System call interface is here.
We used the syscall interface the same as asm-generic version.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
GuanXuetao 2011-01-15 18:15:01 +08:00
parent 87c1a3fb7c
commit 79725df578
10 changed files with 810 additions and 0 deletions

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/*
* linux/arch/unicore32/include/asm/byteorder.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*
* UniCore ONLY support Little Endian mode, the data bus is connected such
* that byte accesses appear as:
* 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
* and word accesses (data or instruction) appear as:
* d0...d31
*/
#ifndef __UNICORE_BYTEORDER_H__
#define __UNICORE_BYTEORDER_H__
#include <linux/byteorder/little_endian.h>
#endif

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/*
* linux/arch/unicore32/include/asm/cpu-single.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __UNICORE_CPU_SINGLE_H__
#define __UNICORE_CPU_SINGLE_H__
#include <asm/page.h>
#include <asm/memory.h>
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#define cpu_switch_mm(pgd, mm) cpu_do_switch_mm(virt_to_phys(pgd), mm)
#define cpu_get_pgd() \
({ \
unsigned long pg; \
__asm__("movc %0, p0.c2, #0" \
: "=r" (pg) : : "cc"); \
pg &= ~0x0fff; \
(pgd_t *)phys_to_virt(pg); \
})
struct mm_struct;
/* declare all the functions as extern */
extern void cpu_proc_fin(void);
extern int cpu_do_idle(void);
extern void cpu_dcache_clean_area(void *, int);
extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
extern void cpu_set_pte(pte_t *ptep, pte_t pte);
extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __UNICORE_CPU_SINGLE_H__ */

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/*
* linux/arch/unicore32/include/asm/cputype.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __UNICORE_CPUTYPE_H__
#define __UNICORE_CPUTYPE_H__
#include <linux/stringify.h>
#define CPUID_CPUID 0
#define CPUID_CACHETYPE 1
#define read_cpuid(reg) \
({ \
unsigned int __val; \
asm("movc %0, p0.c0, #" __stringify(reg) \
: "=r" (__val) \
: \
: "cc"); \
__val; \
})
#define uc32_cpuid read_cpuid(CPUID_CPUID)
#define uc32_cachetype read_cpuid(CPUID_CACHETYPE)
#endif

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/*
* linux/arch/unicore32/include/asm/hwcap.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __UNICORE_HWCAP_H__
#define __UNICORE_HWCAP_H__
/*
* HWCAP flags
*/
#define HWCAP_MSP 1
#define HWCAP_UNICORE16 2
#define HWCAP_CMOV 4
#define HWCAP_UNICORE_F64 8
#define HWCAP_TLS 0x80
#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
/*
* This yields a mask that user programs can use to figure out what
* instruction set this cpu supports.
*/
#define ELF_HWCAP (HWCAP_CMOV | HWCAP_UNICORE_F64)
#endif
#endif

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/*
* linux/arch/unicore32/include/asm/processor.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __UNICORE_PROCESSOR_H__
#define __UNICORE_PROCESSOR_H__
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l; })
#ifdef __KERNEL__
#include <asm/ptrace.h>
#include <asm/types.h>
#ifdef __KERNEL__
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE
#endif
struct debug_entry {
u32 address;
u32 insn;
};
struct debug_info {
int nsaved;
struct debug_entry bp[2];
};
struct thread_struct {
/* fault info */
unsigned long address;
unsigned long trap_no;
unsigned long error_code;
/* debugging */
struct debug_info debug;
};
#define INIT_THREAD { }
#define start_thread(regs, pc, sp) \
({ \
unsigned long *stack = (unsigned long *)sp; \
set_fs(USER_DS); \
memset(regs->uregs, 0, sizeof(regs->uregs)); \
regs->UCreg_asr = USER_MODE; \
regs->UCreg_pc = pc & ~1; /* pc */ \
regs->UCreg_sp = sp; /* sp */ \
regs->UCreg_02 = stack[2]; /* r2 (envp) */ \
regs->UCreg_01 = stack[1]; /* r1 (argv) */ \
regs->UCreg_00 = stack[0]; /* r0 (argc) */ \
})
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
/*
* Create a new kernel thread
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->UCreg_pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->UCreg_sp)
#endif
#endif /* __UNICORE_PROCESSOR_H__ */

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/*
* linux/arch/unicore32/include/asm/system.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __UNICORE_SYSTEM_H__
#define __UNICORE_SYSTEM_H__
#ifdef __KERNEL__
/*
* CR1 bits (CP#0 CR1)
*/
#define CR_M (1 << 0) /* MMU enable */
#define CR_A (1 << 1) /* Alignment abort enable */
#define CR_D (1 << 2) /* Dcache enable */
#define CR_I (1 << 3) /* Icache enable */
#define CR_B (1 << 4) /* Dcache write mechanism: write back */
#define CR_T (1 << 5) /* Burst enable */
#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
#include <linux/irqflags.h>
struct thread_info;
struct task_struct;
struct pt_regs;
void die(const char *msg, struct pt_regs *regs, int err);
struct siginfo;
void uc32_notify_die(const char *str, struct pt_regs *regs,
struct siginfo *info, unsigned long err, unsigned long trap);
void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
struct pt_regs *),
int sig, int code, const char *name);
#define xchg(ptr, x) \
((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
extern asmlinkage void __backtrace(void);
extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
struct mm_struct;
extern void show_pte(struct mm_struct *mm, unsigned long addr);
extern void __show_regs(struct pt_regs *);
extern int cpu_architecture(void);
extern void cpu_init(void);
#define vectors_high() (cr_alignment & CR_V)
#define isb() __asm__ __volatile__ ("" : : : "memory")
#define dsb() __asm__ __volatile__ ("" : : : "memory")
#define dmb() __asm__ __volatile__ ("" : : : "memory")
#define mb() barrier()
#define rmb() barrier()
#define wmb() barrier()
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)
#define set_mb(var, value) do { var = value; smp_mb(); } while (0)
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
extern unsigned long cr_no_alignment; /* defined in entry-unicore.S */
extern unsigned long cr_alignment; /* defined in entry-unicore.S */
static inline unsigned int get_cr(void)
{
unsigned int val;
asm("movc %0, p0.c1, #0" : "=r" (val) : : "cc");
return val;
}
static inline void set_cr(unsigned int val)
{
asm volatile("movc p0.c1, %0, #0 @set CR"
: : "r" (val) : "cc");
isb();
}
extern void adjust_cr(unsigned long mask, unsigned long set);
/*
* switch_to(prev, next) should switch from task `prev' to `next'
* `prev' will never be the same as `next'. schedule() itself
* contains the memory barrier to tell GCC not to cache `current'.
*/
extern struct task_struct *__switch_to(struct task_struct *,
struct thread_info *, struct thread_info *);
extern void panic(const char *fmt, ...);
#define switch_to(prev, next, last) \
do { \
last = __switch_to(prev, \
task_thread_info(prev), task_thread_info(next)); \
} while (0)
static inline unsigned long
__xchg(unsigned long x, volatile void *ptr, int size)
{
unsigned long ret;
switch (size) {
case 1:
asm volatile("@ __xchg1\n"
" swapb %0, %1, [%2]"
: "=&r" (ret)
: "r" (x), "r" (ptr)
: "memory", "cc");
break;
case 4:
asm volatile("@ __xchg4\n"
" swapw %0, %1, [%2]"
: "=&r" (ret)
: "r" (x), "r" (ptr)
: "memory", "cc");
break;
default:
panic("xchg: bad data size: ptr 0x%p, size %d\n",
ptr, size);
}
return ret;
}
#include <asm-generic/cmpxchg-local.h>
/*
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
* them available.
*/
#define cmpxchg_local(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
(unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) \
__cmpxchg64_local_generic((ptr), (o), (n))
#include <asm-generic/cmpxchg.h>
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
#endif /* __KERNEL__ */
#endif

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/*
* linux/arch/unicore32/include/asm/unistd.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#if !defined(__UNICORE_UNISTD_H__) || defined(__SYSCALL)
#define __UNICORE_UNISTD_H__
/* Use the standard ABI for syscalls. */
#include <asm-generic/unistd.h>
#endif /* __UNICORE_UNISTD_H__ */

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arch/unicore32/kernel/sys.c Normal file
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/*
* linux/arch/unicore32/kernel/sys.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <asm/syscalls.h>
#include <asm/cacheflush.h>
/* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid,
struct pt_regs *regs)
{
if (!newsp)
newsp = regs->UCreg_sp;
return do_fork(clone_flags, newsp, regs, 0,
parent_tid, child_tid);
}
/* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
asmlinkage long __sys_execve(const char __user *filename,
const char __user *const __user *argv,
const char __user *const __user *envp,
struct pt_regs *regs)
{
int error;
char *fn;
fn = getname(filename);
error = PTR_ERR(fn);
if (IS_ERR(fn))
goto out;
error = do_execve(fn, argv, envp, regs);
putname(fn);
out:
return error;
}
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
struct pt_regs regs;
int ret;
memset(&regs, 0, sizeof(struct pt_regs));
ret = do_execve(filename,
(const char __user *const __user *)argv,
(const char __user *const __user *)envp, &regs);
if (ret < 0)
goto out;
/*
* Save argc to the register structure for userspace.
*/
regs.UCreg_00 = ret;
/*
* We were successful. We won't be returning to our caller, but
* instead to user space by manipulating the kernel stack.
*/
asm("add r0, %0, %1\n\t"
"mov r1, %2\n\t"
"mov r2, %3\n\t"
"mov r22, #0\n\t" /* not a syscall */
"mov r23, %0\n\t" /* thread structure */
"b.l memmove\n\t" /* copy regs to top of stack */
"mov sp, r0\n\t" /* reposition stack pointer */
"b ret_to_user"
:
: "r" (current_thread_info()),
"Ir" (THREAD_START_SP - sizeof(regs)),
"r" (&regs),
"Ir" (sizeof(regs))
: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
out:
return ret;
}
EXPORT_SYMBOL(kernel_execve);
/* Note: used by the compat code even in 64-bit Linux. */
SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, unsigned long, off_4k)
{
return sys_mmap_pgoff(addr, len, prot, flags, fd,
off_4k);
}
/* Provide the actual syscall number to call mapping. */
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),
/* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */
void *sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls-1] = sys_ni_syscall,
#include <asm/unistd.h>
};

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/*
* linux/arch/unicore32/mm/proc-macros.S
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*
* We need constants.h for:
* VMA_VM_MM
* VMA_VM_FLAGS
* VM_EXEC
*/
#include <generated/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/memory.h>
/*
* the cache line sizes of the I and D cache are the same
*/
#define CACHE_LINESIZE 32
/*
* This is the maximum size of an area which will be invalidated
* using the single invalidate entry instructions. Anything larger
* than this, and we go for the whole cache.
*
* This value should be chosen such that we choose the cheapest
* alternative.
*/
#ifdef CONFIG_CPU_UCV2
#define MAX_AREA_SIZE 0x800 /* 64 cache line */
#endif
/*
* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
*/
.macro vma_vm_mm, rd, rn
ldw \rd, [\rn+], #VMA_VM_MM
.endm
/*
* vma_vm_flags - get vma->vm_flags
*/
.macro vma_vm_flags, rd, rn
ldw \rd, [\rn+], #VMA_VM_FLAGS
.endm
.macro tsk_mm, rd, rn
ldw \rd, [\rn+], #TI_TASK
ldw \rd, [\rd+], #TSK_ACTIVE_MM
.endm
/*
* act_mm - get current->active_mm
*/
.macro act_mm, rd
andn \rd, sp, #8128
andn \rd, \rd, #63
ldw \rd, [\rd+], #TI_TASK
ldw \rd, [\rd+], #TSK_ACTIVE_MM
.endm
/*
* mmid - get context id from mm pointer (mm->context.id)
*/
.macro mmid, rd, rn
ldw \rd, [\rn+], #MM_CONTEXT_ID
.endm
/*
* mask_asid - mask the ASID from the context ID
*/
.macro asid, rd, rn
and \rd, \rn, #255
.endm
.macro crval, clear, mmuset, ucset
.word \clear
.word \mmuset
.endm
#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
/*
* va2pa va, pa, tbl, msk, off, err
* This macro is used to translate virtual address to its physical address.
*
* va: virtual address
* pa: physical address, result is stored in this register
* tbl, msk, off: temp registers, will be destroyed
* err: jump to error label if the physical address not exist
* NOTE: all regs must be different
*/
.macro va2pa, va, pa, tbl, msk, off, err=990f
movc \pa, p0.c2, #0
mov \off, \va >> #22 @ off <- index of 1st page table
adr \tbl, 910f @ tbl <- table of 1st page table
900: @ ---- handle 1, 2 page table
add \pa, \pa, #PAGE_OFFSET @ pa <- virt addr of page table
ldw \pa, [\pa+], \off << #2 @ pa <- the content of pt
cand.a \pa, #4 @ test exist bit
beq \err @ if not exist
and \off, \pa, #3 @ off <- the last 2 bits
add \tbl, \tbl, \off << #3 @ cmove table pointer
ldw \msk, [\tbl+], #0 @ get the mask
ldw pc, [\tbl+], #4
930: @ ---- handle 2nd page table
and \pa, \pa, \msk @ pa <- phys addr of 2nd pt
mov \off, \va << #10
cntlo \tbl, \msk @ use tbl as temp reg
mov \off, \off >> \tbl
mov \off, \off >> #2 @ off <- index of 2nd pt
adr \tbl, 920f @ tbl <- table of 2nd pt
b 900b
910: @ 1st level page table
.word 0xfffff000, 930b @ second level page table
.word 0xfffffc00, 930b @ second level large page table
.word 0x00000000, \err @ invalid
.word 0xffc00000, 980f @ super page
920: @ 2nd level page table
.word 0xfffff000, 980f @ page
.word 0xffffc000, 980f @ middle page
.word 0xffff0000, 980f @ large page
.word 0x00000000, \err @ invalid
980:
andn \tbl, \va, \msk
and \pa, \pa, \msk
or \pa, \pa, \tbl
990:
.endm
#endif
.macro dcacheline_flush, addr, t1, t2
mov \t1, \addr << #20
ldw \t2, =_stext @ _stext must ALIGN(4096)
add \t2, \t2, \t1 >> #20
ldw \t1, [\t2+], #0x0000
ldw \t1, [\t2+], #0x1000
ldw \t1, [\t2+], #0x2000
ldw \t1, [\t2+], #0x3000
.endm

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/*
* linux/arch/unicore32/mm/proc-ucv2.S
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include "proc-macros.S"
ENTRY(cpu_proc_fin)
stm.w (lr), [sp-]
mov ip, #PSR_R_BIT | PSR_I_BIT | PRIV_MODE
mov.a asr, ip
b.l __cpuc_flush_kern_all
ldm.w (pc), [sp]+
/*
* cpu_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
*/
.align 5
ENTRY(cpu_reset)
mov ip, #0
movc p0.c5, ip, #28 @ Cache invalidate all
nop8
movc p0.c6, ip, #6 @ TLB invalidate all
nop8
movc ip, p0.c1, #0 @ ctrl register
or ip, ip, #0x2000 @ vector base address
andn ip, ip, #0x000f @ ............idam
movc p0.c1, ip, #0 @ disable caches and mmu
nop
mov pc, r0 @ jump to loc
nop8
/*
* cpu_do_idle()
*
* Idle the processor (eg, wait for interrupt).
*
* IRQs are already disabled.
*/
ENTRY(cpu_do_idle)
mov r0, #0 @ PCI address
.rept 8
ldw r1, [r0]
.endr
mov pc, lr
ENTRY(cpu_dcache_clean_area)
#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
csub.a r1, #MAX_AREA_SIZE
bsg 101f
mov r9, #PAGE_SZ
sub r9, r9, #1 @ PAGE_MASK
1: va2pa r0, r10, r11, r12, r13 @ r10 is PA
b 3f
2: cand.a r0, r9
beq 1b
3: movc p0.c5, r10, #11 @ clean D entry
nop8
add r0, r0, #CACHE_LINESIZE
add r10, r10, #CACHE_LINESIZE
sub.a r1, r1, #CACHE_LINESIZE
bua 2b
mov pc, lr
#endif
101: mov ip, #0
movc p0.c5, ip, #10 @ Dcache clean all
nop8
mov pc, lr
/*
* cpu_do_switch_mm(pgd_phys)
*
* Set the translation table base pointer to be pgd_phys
*
* - pgd_phys - physical address of new pgd
*
* It is assumed that:
* - we are not using split page tables
*/
.align 5
ENTRY(cpu_do_switch_mm)
movc p0.c2, r0, #0 @ update page table ptr
nop8
movc p0.c6, ip, #6 @ TLB invalidate all
nop8
mov pc, lr
/*
* cpu_set_pte(ptep, pte)
*
* Set a level 2 translation table entry.
*
* - ptep - pointer to level 2 translation table entry
* - pte - PTE value to store
*/
.align 5
ENTRY(cpu_set_pte)
stw r1, [r0]
#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
sub r2, r0, #PAGE_OFFSET
movc p0.c5, r2, #11 @ Dcache clean line
nop8
#else
mov ip, #0
movc p0.c5, ip, #10 @ Dcache clean all
nop8
@dcacheline_flush r0, r2, ip
#endif
mov pc, lr