mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-22 17:33:01 +00:00
e344b63eee
The attached patches provides part 7 of an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
433 lines
13 KiB
C
433 lines
13 KiB
C
#ifndef XTENSA_CACHEATTRASM_H
|
|
#define XTENSA_CACHEATTRASM_H
|
|
|
|
/*
|
|
* THIS FILE IS GENERATED -- DO NOT MODIFY BY HAND
|
|
*
|
|
* include/asm-xtensa/xtensa/cacheattrasm.h -- assembler-specific
|
|
* CACHEATTR register related definitions that depend on CORE
|
|
* configuration.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2002 Tensilica Inc.
|
|
*/
|
|
|
|
|
|
#include <xtensa/coreasm.h>
|
|
|
|
|
|
/*
|
|
* This header file defines assembler macros of the form:
|
|
* <x>cacheattr_<func>
|
|
* where:
|
|
* <x> is 'i', 'd' or absent for instruction, data
|
|
* or both caches; and
|
|
* <func> indicates the function of the macro.
|
|
*
|
|
* The following functions are defined:
|
|
*
|
|
* icacheattr_get
|
|
* Reads I-cache CACHEATTR into a2 (clobbers a3-a5).
|
|
*
|
|
* dcacheattr_get
|
|
* Reads D-cache CACHEATTR into a2 (clobbers a3-a5).
|
|
* (Note: for configs with a real CACHEATTR register, the
|
|
* above two macros are identical.)
|
|
*
|
|
* cacheattr_set
|
|
* Writes both I-cache and D-cache CACHEATTRs from a2 (a3-a8 clobbered).
|
|
* Works even when changing one's own code's attributes.
|
|
*
|
|
* icacheattr_is_enabled label
|
|
* Branches to \label if I-cache appears to have been enabled
|
|
* (eg. if CACHEATTR contains a cache-enabled attribute).
|
|
* (clobbers a2-a5,SAR)
|
|
*
|
|
* dcacheattr_is_enabled label
|
|
* Branches to \label if D-cache appears to have been enabled
|
|
* (eg. if CACHEATTR contains a cache-enabled attribute).
|
|
* (clobbers a2-a5,SAR)
|
|
*
|
|
* cacheattr_is_enabled label
|
|
* Branches to \label if either I-cache or D-cache appears to have been enabled
|
|
* (eg. if CACHEATTR contains a cache-enabled attribute).
|
|
* (clobbers a2-a5,SAR)
|
|
*
|
|
* The following macros are only defined under certain conditions:
|
|
*
|
|
* icacheattr_set (if XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR)
|
|
* Writes I-cache CACHEATTR from a2 (a3-a8 clobbered).
|
|
*
|
|
* dcacheattr_set (if XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR)
|
|
* Writes D-cache CACHEATTR from a2 (a3-a8 clobbered).
|
|
*/
|
|
|
|
|
|
|
|
/*************************** GENERIC -- ALL CACHES ***************************/
|
|
|
|
/*
|
|
* _cacheattr_get
|
|
*
|
|
* (Internal macro.)
|
|
* Returns value of CACHEATTR register (or closest equivalent) in a2.
|
|
*
|
|
* Entry:
|
|
* (none)
|
|
* Exit:
|
|
* a2 value read from CACHEATTR
|
|
* a3-a5 clobbered (temporaries)
|
|
*/
|
|
.macro _cacheattr_get tlb
|
|
#if XCHAL_HAVE_CACHEATTR
|
|
rsr a2, CACHEATTR
|
|
#elif XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
// We have a config that "mimics" CACHEATTR using a simplified
|
|
// "MMU" composed of a single statically-mapped way.
|
|
// DTLB and ITLB are independent, so there's no single
|
|
// cache attribute that can describe both. So for now
|
|
// just return the DTLB state.
|
|
movi a5, 0xE0000000
|
|
movi a2, 0
|
|
movi a3, 0
|
|
1: add a3, a3, a5 // next segment
|
|
r&tlb&1 a4, a3 // get PPN+CA of segment at 0xE0000000, 0xC0000000, ..., 0
|
|
dsync // interlock???
|
|
slli a2, a2, 4
|
|
extui a4, a4, 0, 4 // extract CA
|
|
or a2, a2, a4
|
|
bnez a3, 1b
|
|
#else
|
|
// This macro isn't applicable to arbitrary MMU configurations.
|
|
// Just return zero.
|
|
movi a2, 0
|
|
#endif
|
|
.endm
|
|
|
|
.macro icacheattr_get
|
|
_cacheattr_get itlb
|
|
.endm
|
|
|
|
.macro dcacheattr_get
|
|
_cacheattr_get dtlb
|
|
.endm
|
|
|
|
|
|
#define XCHAL_CACHEATTR_ALL_BYPASS 0x22222222 /* default (powerup/reset) value of CACHEATTR, all BYPASS
|
|
mode (ie. disabled/bypassed caches) */
|
|
|
|
#if XCHAL_HAVE_CACHEATTR || XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
|
|
#define XCHAL_FCA_ENAMASK 0x001A /* bitmap of fetch attributes that require enabled icache */
|
|
#define XCHAL_LCA_ENAMASK 0x0003 /* bitmap of load attributes that require enabled dcache */
|
|
#define XCHAL_SCA_ENAMASK 0x0003 /* bitmap of store attributes that require enabled dcache */
|
|
#define XCHAL_LSCA_ENAMASK (XCHAL_LCA_ENAMASK|XCHAL_SCA_ENAMASK) /* l/s attrs requiring enabled dcache */
|
|
#define XCHAL_ALLCA_ENAMASK (XCHAL_FCA_ENAMASK|XCHAL_LSCA_ENAMASK) /* all attrs requiring enabled caches */
|
|
|
|
/*
|
|
* _cacheattr_is_enabled
|
|
*
|
|
* (Internal macro.)
|
|
* Branches to \label if CACHEATTR in a2 indicates an enabled
|
|
* cache, using mask in a3.
|
|
*
|
|
* Parameters:
|
|
* label where to branch to if cache is enabled
|
|
* Entry:
|
|
* a2 contains CACHEATTR value used to determine whether
|
|
* caches are enabled
|
|
* a3 16-bit constant where each bit correspond to
|
|
* one of the 16 possible CA values (in a CACHEATTR mask);
|
|
* CA values that indicate the cache is enabled
|
|
* have their corresponding bit set in this mask
|
|
* (eg. use XCHAL_xCA_ENAMASK , above)
|
|
* Exit:
|
|
* a2,a4,a5 clobbered
|
|
* SAR clobbered
|
|
*/
|
|
.macro _cacheattr_is_enabled label
|
|
movi a4, 8 // loop 8 times
|
|
.Lcaife\@:
|
|
extui a5, a2, 0, 4 // get CA nibble
|
|
ssr a5 // index into mask according to CA...
|
|
srl a5, a3 // ...and get CA's mask bit in a5 bit 0
|
|
bbsi.l a5, 0, \label // if CA indicates cache enabled, jump to label
|
|
srli a2, a2, 4 // next nibble
|
|
addi a4, a4, -1
|
|
bnez a4, .Lcaife\@ // loop for each nibble
|
|
.endm
|
|
|
|
#else /* XCHAL_HAVE_CACHEATTR || XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR */
|
|
.macro _cacheattr_is_enabled label
|
|
j \label // macro not applicable, assume caches always enabled
|
|
.endm
|
|
#endif /* XCHAL_HAVE_CACHEATTR || XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR */
|
|
|
|
|
|
|
|
/*
|
|
* icacheattr_is_enabled
|
|
*
|
|
* Branches to \label if I-cache is enabled.
|
|
*
|
|
* Parameters:
|
|
* label where to branch to if icache is enabled
|
|
* Entry:
|
|
* (none)
|
|
* Exit:
|
|
* a2-a5, SAR clobbered (temporaries)
|
|
*/
|
|
.macro icacheattr_is_enabled label
|
|
#if XCHAL_HAVE_CACHEATTR || XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
icacheattr_get
|
|
movi a3, XCHAL_FCA_ENAMASK
|
|
#endif
|
|
_cacheattr_is_enabled \label
|
|
.endm
|
|
|
|
/*
|
|
* dcacheattr_is_enabled
|
|
*
|
|
* Branches to \label if D-cache is enabled.
|
|
*
|
|
* Parameters:
|
|
* label where to branch to if dcache is enabled
|
|
* Entry:
|
|
* (none)
|
|
* Exit:
|
|
* a2-a5, SAR clobbered (temporaries)
|
|
*/
|
|
.macro dcacheattr_is_enabled label
|
|
#if XCHAL_HAVE_CACHEATTR || XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
dcacheattr_get
|
|
movi a3, XCHAL_LSCA_ENAMASK
|
|
#endif
|
|
_cacheattr_is_enabled \label
|
|
.endm
|
|
|
|
/*
|
|
* cacheattr_is_enabled
|
|
*
|
|
* Branches to \label if either I-cache or D-cache is enabled.
|
|
*
|
|
* Parameters:
|
|
* label where to branch to if a cache is enabled
|
|
* Entry:
|
|
* (none)
|
|
* Exit:
|
|
* a2-a5, SAR clobbered (temporaries)
|
|
*/
|
|
.macro cacheattr_is_enabled label
|
|
#if XCHAL_HAVE_CACHEATTR
|
|
rsr a2, CACHEATTR
|
|
movi a3, XCHAL_ALLCA_ENAMASK
|
|
#elif XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
icacheattr_get
|
|
movi a3, XCHAL_FCA_ENAMASK
|
|
_cacheattr_is_enabled \label
|
|
dcacheattr_get
|
|
movi a3, XCHAL_LSCA_ENAMASK
|
|
#endif
|
|
_cacheattr_is_enabled \label
|
|
.endm
|
|
|
|
|
|
|
|
/*
|
|
* The ISA does not have a defined way to change the
|
|
* instruction cache attributes of the running code,
|
|
* ie. of the memory area that encloses the current PC.
|
|
* However, each micro-architecture (or class of
|
|
* configurations within a micro-architecture)
|
|
* provides a way to deal with this issue.
|
|
*
|
|
* Here are a few macros used to implement the relevant
|
|
* approach taken.
|
|
*/
|
|
|
|
#if XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
// We have a config that "mimics" CACHEATTR using a simplified
|
|
// "MMU" composed of a single statically-mapped way.
|
|
|
|
/*
|
|
* icacheattr_set
|
|
*
|
|
* Entry:
|
|
* a2 cacheattr value to set
|
|
* Exit:
|
|
* a2 unchanged
|
|
* a3-a8 clobbered (temporaries)
|
|
*/
|
|
.macro icacheattr_set
|
|
|
|
movi a5, 0xE0000000 // mask of upper 3 bits
|
|
movi a6, 3f // PC where ITLB is set
|
|
movi a3, 0 // start at region 0 (0 .. 7)
|
|
and a6, a6, a5 // upper 3 bits of local PC area
|
|
mov a7, a2 // copy a2 so it doesn't get clobbered
|
|
j 3f
|
|
|
|
# if XCHAL_HAVE_XLT_CACHEATTR
|
|
// Can do translations, use generic method:
|
|
1: sub a6, a3, a5 // address of some other segment
|
|
ritlb1 a8, a6 // save its PPN+CA
|
|
dsync // interlock??
|
|
witlb a4, a6 // make it translate to this code area
|
|
movi a6, 5f // where to jump into it
|
|
isync
|
|
sub a6, a6, a5 // adjust jump address within that other segment
|
|
jx a6
|
|
|
|
// Note that in the following code snippet, which runs at a different virtual
|
|
// address than it is assembled for, we avoid using literals (eg. via movi/l32r)
|
|
// just in case literals end up in a different 512 MB segment, and we avoid
|
|
// instructions that rely on the current PC being what is expected.
|
|
//
|
|
.align 4
|
|
_j 6f // this is at label '5' minus 4 bytes
|
|
.align 4
|
|
5: witlb a4, a3 // we're in other segment, now can write previous segment's CA
|
|
isync
|
|
add a6, a6, a5 // back to previous segment
|
|
addi a6, a6, -4 // next jump label
|
|
jx a6
|
|
|
|
6: sub a6, a3, a5 // address of some other segment
|
|
witlb a8, a6 // restore PPN+CA of other segment
|
|
mov a6, a3 // restore a6
|
|
isync
|
|
# else /* XCHAL_HAVE_XLT_CACHEATTR */
|
|
// Use micro-architecture specific method.
|
|
// The following 4-instruction sequence is aligned such that
|
|
// it all fits within a single I-cache line. Sixteen byte
|
|
// alignment is sufficient for this (using XCHAL_ICACHE_LINESIZE
|
|
// actually causes problems because that can be greater than
|
|
// the alignment of the reset vector, where this macro is often
|
|
// invoked, which would cause the linker to align the reset
|
|
// vector code away from the reset vector!!).
|
|
.align 16 /*XCHAL_ICACHE_LINESIZE*/
|
|
1: _witlb a4, a3 // write wired PTE (CA, no PPN) of 512MB segment to ITLB
|
|
_isync
|
|
nop
|
|
nop
|
|
# endif /* XCHAL_HAVE_XLT_CACHEATTR */
|
|
beq a3, a5, 4f // done?
|
|
|
|
// Note that in the WITLB loop, we don't do any load/stores
|
|
// (may not be an issue here, but it is important in the DTLB case).
|
|
2: srli a7, a7, 4 // next CA
|
|
sub a3, a3, a5 // next segment (add 0x20000000)
|
|
3:
|
|
# if XCHAL_HAVE_XLT_CACHEATTR /* if have translation, preserve it */
|
|
ritlb1 a8, a3 // get current PPN+CA of segment
|
|
dsync // interlock???
|
|
extui a4, a7, 0, 4 // extract CA to set
|
|
srli a8, a8, 4 // clear CA but keep PPN ...
|
|
slli a8, a8, 4 // ...
|
|
add a4, a4, a8 // combine new CA with PPN to preserve
|
|
# else
|
|
extui a4, a7, 0, 4 // extract CA
|
|
# endif
|
|
beq a3, a6, 1b // current PC's region? if so, do it in a safe way
|
|
witlb a4, a3 // write wired PTE (CA [+PPN]) of 512MB segment to ITLB
|
|
bne a3, a5, 2b
|
|
isync // make sure all ifetch changes take effect
|
|
4:
|
|
.endm // icacheattr_set
|
|
|
|
|
|
/*
|
|
* dcacheattr_set
|
|
*
|
|
* Entry:
|
|
* a2 cacheattr value to set
|
|
* Exit:
|
|
* a2 unchanged
|
|
* a3-a8 clobbered (temporaries)
|
|
*/
|
|
|
|
.macro dcacheattr_set
|
|
|
|
movi a5, 0xE0000000 // mask of upper 3 bits
|
|
movi a3, 0 // start at region 0 (0 .. 7)
|
|
mov a7, a2 // copy a2 so it doesn't get clobbered
|
|
j 3f
|
|
// Note that in the WDTLB loop, we don't do any load/stores
|
|
// (including implicit l32r via movi) because it isn't safe.
|
|
2: srli a7, a7, 4 // next CA
|
|
sub a3, a3, a5 // next segment (add 0x20000000)
|
|
3:
|
|
# if XCHAL_HAVE_XLT_CACHEATTR /* if have translation, preserve it */
|
|
rdtlb1 a8, a3 // get current PPN+CA of segment
|
|
dsync // interlock???
|
|
extui a4, a7, 0, 4 // extract CA to set
|
|
srli a8, a8, 4 // clear CA but keep PPN ...
|
|
slli a8, a8, 4 // ...
|
|
add a4, a4, a8 // combine new CA with PPN to preserve
|
|
# else
|
|
extui a4, a7, 0, 4 // extract CA to set
|
|
# endif
|
|
wdtlb a4, a3 // write wired PTE (CA [+PPN]) of 512MB segment to DTLB
|
|
bne a3, a5, 2b
|
|
dsync // make sure all data path changes take effect
|
|
.endm // dcacheattr_set
|
|
|
|
#endif /* XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR */
|
|
|
|
|
|
|
|
/*
|
|
* cacheattr_set
|
|
*
|
|
* Macro that sets the current CACHEATTR safely
|
|
* (both i and d) according to the current contents of a2.
|
|
* It works even when changing the cache attributes of
|
|
* the currently running code.
|
|
*
|
|
* Entry:
|
|
* a2 cacheattr value to set
|
|
* Exit:
|
|
* a2 unchanged
|
|
* a3-a8 clobbered (temporaries)
|
|
*/
|
|
.macro cacheattr_set
|
|
|
|
#if XCHAL_HAVE_CACHEATTR
|
|
# if XCHAL_ICACHE_LINESIZE < 4
|
|
// No i-cache, so can always safely write to CACHEATTR:
|
|
wsr a2, CACHEATTR
|
|
# else
|
|
// The Athens micro-architecture, when using the old
|
|
// exception architecture option (ie. with the CACHEATTR register)
|
|
// allows changing the cache attributes of the running code
|
|
// using the following exact sequence aligned to be within
|
|
// an instruction cache line. (NOTE: using XCHAL_ICACHE_LINESIZE
|
|
// alignment actually causes problems because that can be greater
|
|
// than the alignment of the reset vector, where this macro is often
|
|
// invoked, which would cause the linker to align the reset
|
|
// vector code away from the reset vector!!).
|
|
j 1f
|
|
.align 16 /*XCHAL_ICACHE_LINESIZE*/ // align to within an I-cache line
|
|
1: _wsr a2, CACHEATTR
|
|
_isync
|
|
nop
|
|
nop
|
|
# endif
|
|
#elif XCHAL_HAVE_MIMIC_CACHEATTR || XCHAL_HAVE_XLT_CACHEATTR
|
|
// DTLB and ITLB are independent, but to keep semantics
|
|
// of this macro we simply write to both.
|
|
icacheattr_set
|
|
dcacheattr_set
|
|
#else
|
|
// This macro isn't applicable to arbitrary MMU configurations.
|
|
// Do nothing in this case.
|
|
#endif
|
|
.endm
|
|
|
|
|
|
#endif /*XTENSA_CACHEATTRASM_H*/
|
|
|