cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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srmmu_access.S (1937B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* Assembler variants of srmmu access functions.
      3 * Implemented in assembler to allow run-time patching.
      4 * LEON uses a different ASI for MMUREGS than SUN.
      5 *
      6 * The leon_1insn_patch infrastructure is used
      7 * for the run-time patching.
      8 */
      9
     10#include <linux/linkage.h>
     11
     12#include <asm/asmmacro.h>
     13#include <asm/pgtsrmmu.h>
     14#include <asm/asi.h>
     15
     16/* unsigned int srmmu_get_mmureg(void) */
     17ENTRY(srmmu_get_mmureg)
     18LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %o0)
     19SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %o0)
     20	retl
     21	 nop
     22ENDPROC(srmmu_get_mmureg)
     23
     24/* void srmmu_set_mmureg(unsigned long regval) */
     25ENTRY(srmmu_set_mmureg)
     26LEON_PI(sta	%o0, [%g0] ASI_LEON_MMUREGS)
     27SUN_PI_(sta	%o0, [%g0] ASI_M_MMUREGS)
     28	retl
     29	 nop
     30ENDPROC(srmmu_set_mmureg)
     31
     32/* void srmmu_set_ctable_ptr(unsigned long paddr) */
     33ENTRY(srmmu_set_ctable_ptr)
     34	/* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */
     35	srl	%o0, 4, %g1
     36	and	%g1, SRMMU_CTX_PMASK, %g1
     37
     38	mov	SRMMU_CTXTBL_PTR, %g2
     39LEON_PI(sta	%g1, [%g2] ASI_LEON_MMUREGS)
     40SUN_PI_(sta	%g1, [%g2] ASI_M_MMUREGS)
     41	retl
     42	 nop
     43ENDPROC(srmmu_set_ctable_ptr)
     44
     45
     46/* void srmmu_set_context(int context) */
     47ENTRY(srmmu_set_context)
     48	mov	SRMMU_CTX_REG, %g1
     49LEON_PI(sta	%o0, [%g1] ASI_LEON_MMUREGS)
     50SUN_PI_(sta	%o0, [%g1] ASI_M_MMUREGS)
     51	retl
     52	 nop
     53ENDPROC(srmmu_set_context)
     54
     55
     56/* int srmmu_get_context(void) */
     57ENTRY(srmmu_get_context)
     58	mov	SRMMU_CTX_REG, %o0
     59LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
     60SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)
     61	retl
     62	 nop
     63ENDPROC(srmmu_get_context)
     64
     65
     66/* unsigned int srmmu_get_fstatus(void) */
     67ENTRY(srmmu_get_fstatus)
     68	mov	SRMMU_FAULT_STATUS, %o0
     69LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
     70SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)
     71	retl
     72	 nop
     73ENDPROC(srmmu_get_fstatus)
     74
     75
     76/* unsigned int srmmu_get_faddr(void) */
     77ENTRY(srmmu_get_faddr)
     78	mov	SRMMU_FAULT_ADDR, %o0
     79LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
     80SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)
     81	retl
     82	 nop
     83ENDPROC(srmmu_get_faddr)