@@ -218,6 +218,18 @@ config MIPS_CM_BASE
the GCRs occupy a region of the physical address space which is
otherwise unused, or at minimum that software doesn't need to access.
+config MIPS_CACHE_INDEX_BASE
+ hex "Index base address for cache initialisation"
+ default 0x80000000 if CPU_MIPS32
+ default 0xffffffff80000000 if CPU_MIPS64
+ help
+ This is the base address for a memory block, which is used for
+ initialising the cache lines. This is also the base address of a memory
+ block which is used for loading and filling cache lines when
+ SYS_MIPS_CACHE_INIT_RAM_LOAD is selected.
+ Normally this is CKSEG0. If the MIPS system needs to move this block
+ to some SRAM or ScratchPad RAM, adapt this option accordingly.
+
endmenu
menu "OS boot interface"
@@ -18,8 +18,6 @@
#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT
#endif
-#define INDEX_BASE CKSEG0
-
.macro f_fill64 dst, offset, val
LONG_S \val, (\offset + 0 * LONGSIZE)(\dst)
LONG_S \val, (\offset + 1 * LONGSIZE)(\dst)
@@ -256,7 +254,7 @@ l2_probe_done:
/*
* Now clear that much memory starting from zero.
*/
- PTR_LI a0, CKSEG1
+ PTR_LI a0, CKSEG1ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
PTR_ADDU a1, a0, v0
2: PTR_ADDIU a0, 64
f_fill64 a0, -64, zero
@@ -272,7 +270,7 @@ l2_probe_done:
bnez R_L2_BYPASSED, l1_init
l2_init:
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
PTR_ADDU t1, t0, R_L2_SIZE
1: cache INDEX_STORE_TAG_SD, 0(t0)
PTR_ADDU t0, t0, R_L2_LINE
@@ -308,16 +306,16 @@ l1_init:
* Initialize the I-cache first,
*/
blez R_IC_SIZE, 1f
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
PTR_ADDU t1, t0, R_IC_SIZE
/* clear tag to invalidate */
cache_loop t0, t1, R_IC_LINE, INDEX_STORE_TAG_I
#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
/* fill once, so data field parity is correct */
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
cache_loop t0, t1, R_IC_LINE, FILL
/* invalidate again - prudent but not strictly neccessary */
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
cache_loop t0, t1, R_IC_LINE, INDEX_STORE_TAG_I
#endif
sync
@@ -340,18 +338,18 @@ l1_init:
* then initialize D-cache.
*/
1: blez R_DC_SIZE, 3f
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
PTR_ADDU t1, t0, R_DC_SIZE
/* clear all tags */
cache_loop t0, t1, R_DC_LINE, INDEX_STORE_TAG_D
#ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
/* load from each line (in cached space) */
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
2: LONG_L zero, 0(t0)
PTR_ADDU t0, R_DC_LINE
bne t0, t1, 2b
/* clear all tags */
- PTR_LI t0, INDEX_BASE
+ PTR_LI t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
cache_loop t0, t1, R_DC_LINE, INDEX_STORE_TAG_D
#endif
3:
The index base address used for the cache initialisation is currently hard-coded to CKSEG0. Make this value configurable if a MIPS system needs to have a different address (e.g. in SRAM or ScratchPad RAM). Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> --- arch/mips/Kconfig | 12 ++++++++++++ arch/mips/lib/cache_init.S | 18 ++++++++---------- 2 files changed, 20 insertions(+), 10 deletions(-)