mmuPro32ALib.s
上传用户:nvosite88
上传日期:2007-01-17
资源大小:4983k
文件大小:4k
- /* mmuPro32ALib.s - MMU library for PentiumPro/2/3/4 32 bit mode */
- /* Copyright 1984-2001 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01c,27aug01,hdn added FUNC/FUNC_LABEL, replaced .align with .balign
- preserved IF bit in EFLAGS
- 01e,17sep98,hdn renamed mmuEnabled to mmuPro32Enabled.
- 01d,21apr98,hdn updated a comment in the header.
- 01c,13apr98,hdn added support for PentiumPro's 32bit MMU.
- 01b,02nov94,hdn added a support for PCD and PWT bit for 486 and Pentium
- 01a,26jul93,hdn written.
- */
- /*
- */
- #define _ASMLANGUAGE
- #include "vxWorks.h"
- #include "asm.h"
- #include "regs.h"
- /* externals */
- .globl VAR(mmuPro32Enabled)
- .globl VAR(sysProcessor)
- /* internals */
- .globl GTEXT(mmuPro32Enable)
- .globl GTEXT(mmuPro32On)
- .globl GTEXT(mmuPro32Off)
- .globl GTEXT(mmuPro32PdbrSet)
- .globl GTEXT(mmuPro32PdbrGet)
- .globl GTEXT(mmuPro32TLBFlush)
- .text
- .balign 16
-
- /******************************************************************************
- *
- * mmuPro32Enable - turn mmu on or off
- *
- * RETURNS: OK
- * STATUS mmuPro32Enable
- * (
- * BOOL enable /@ TRUE to enable, FALSE to disable MMU @/
- * )
- */
- FUNC_LABEL(mmuPro32Enable)
- pushfl /* save EFLAGS */
- cli /* LOCK INTERRUPT */
- movl SP_ARG1+4(%esp),%edx
- movl %cr0,%eax
- movl %edx,FUNC(mmuPro32Enabled)
- cmpl $0,%edx
- je mmuPro32Disable
- orl $0x80010000,%eax /* set PG and WP */
- jmp mmuPro32Enable0
- mmuPro32Disable:
- andl $0x7ffeffff,%eax /* clear PG and WP */
- mmuPro32Enable0:
- movl %eax,%cr0
- jmp mmuPro32Enable1 /* flush prefetch queue */
- mmuPro32Enable1:
- movl $0,%eax
- popfl /* UNLOCK INTERRUPT */
- ret
- /******************************************************************************
- *
- * mmuPro32On - turn MMU on
- *
- * This routine assumes that interrupts are locked out. It is called internally
- * to enable the mmu after it has been disabled for a short period of time
- * to access internal data structs.
- *
- * NOMANUAL
- * void mmuPro32On (void)
- */
- .balign 16,0x90
- FUNC_LABEL(mmuPro32On)
- movl %cr0,%eax
- orl $0x80010000,%eax /* set PG and WP */
- movl %eax,%cr0
- jmp mmuPro32On0 /* flush prefetch queue */
- mmuPro32On0:
- ret
- /******************************************************************************
- *
- * mmuPro32Off - turn MMU off
- *
- * This routine assumes that interrupts are locked out. It is called internally
- * to disable the mmu for a short period of time
- * to access internal data structs.
- *
- * NOMANUAL
- * void mmuPro32Off (void)
- */
- .balign 16,0x90
- FUNC_LABEL(mmuPro32Off)
- movl %cr0,%eax
- andl $0x7ffeffff,%eax /* clear PG and WP */
- movl %eax,%cr0
- jmp mmuPro32Off0 /* flush prefetch queue */
- mmuPro32Off0:
- ret
- /*******************************************************************************
- *
- * mmuPro32PdbrSet - Set Page Directory Base Register
- *
- * This routine Set Page Directory Base Register.
- *
- * NOMANUAL
- * void mmuPro32PdbrSet
- * (
- * void * transTbl;
- * )
-
- */
- .balign 16,0x90
- FUNC_LABEL(mmuPro32PdbrSet)
- pushfl /* save EFLAGS */
- cli /* LOCK INTERRUPT */
- movl SP_ARG1+4(%esp),%eax
- movl (%eax),%eax
- movl %cr3,%edx
- movl $0xfffff000,%ecx /* upper 20 bits */
- andl $0x00000fff,%edx
- cmpl $ X86CPU_386,FUNC(sysProcessor)
- je mmuPro32PdbrSet1
- movl $0xffffffe0,%ecx /* upper 27 bits */
- andl $0x00000007,%edx /* PCD=0 PWT=0 */
- mmuPro32PdbrSet1:
- andl %ecx,%eax
- orl %edx,%eax
- movl %eax,%cr3
- jmp mmuPro32PdbrSet0 /* flush prefetch queue */
- mmuPro32PdbrSet0:
- popfl /* UNLOCK INTERRUPT */
- ret
- /*******************************************************************************
- *
- * mmuPro32PdbrGet - Get Page Directory Base Register
- *
- * This routine Get Page Directory Base Register.
- *
- * NOMANUAL
- * MMU_TRANS_TBL * mmuPro32PdbrGet (void)
-
- */
- .balign 16,0x90
- FUNC_LABEL(mmuPro32PdbrGet)
- movl %cr3,%eax
- movl $0xfffff000,%edx /* upper 20 bits */
- cmpl $ X86CPU_386,FUNC(sysProcessor)
- je mmuPro32PdbrGet1
- movl $0xffffffe0,%edx /* upper 27 bits */
- mmuPro32PdbrGet1:
- andl %edx,%eax
- ret
- /******************************************************************************
- *
- * mmuPro32TLBFlush - flush the Translation Lookaside Buffer.
- *
- * NOMANUAL
- * void mmuPro32TLBFlush (void)
- */
- .balign 16,0x90
- FUNC_LABEL(mmuPro32TLBFlush)
- pushfl /* save EFLAGS */
- cli /* LOCK INTERRUPT */
- movl %cr3,%eax
- movl %eax,%cr3
- jmp mmuPro32TLBFlush0 /* flush prefetch queue */
- mmuPro32TLBFlush0:
- popfl /* UNLOCK INTERRUPT */
- ret