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authorGreg Watson <jarrah@users.sourceforge.net>2003-11-15 15:16:56 +0000
committerGreg Watson <jarrah@users.sourceforge.net>2003-11-15 15:16:56 +0000
commit4d7b729e4bffafde517628f9cc22bff929816439 (patch)
tree1e9da9953cd83768c5c8b67d3b45c5bef2b18419 /src/cpu/ppc/mpc74xx/mpc74xx.inc
parentb3883f393ec9e06f5afa4a7c24c87a8791e2b459 (diff)
setup and initialize cache correctly
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1283 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu/ppc/mpc74xx/mpc74xx.inc')
-rw-r--r--src/cpu/ppc/mpc74xx/mpc74xx.inc75
1 files changed, 38 insertions, 37 deletions
diff --git a/src/cpu/ppc/mpc74xx/mpc74xx.inc b/src/cpu/ppc/mpc74xx/mpc74xx.inc
index 5f6cee20dc..3391b28a44 100644
--- a/src/cpu/ppc/mpc74xx/mpc74xx.inc
+++ b/src/cpu/ppc/mpc74xx/mpc74xx.inc
@@ -13,9 +13,9 @@
*
* - enable L1 I/D caches, otherwise performance will be slow
* - set up DBATs for the following regions:
- * - RAM (generally 0x00000000 - 0x7fffffff)
- * - ROM (_ROMBASE - _ROMBASE + 16Mb)
- * - I/O (generally 0xfc000000 - 0xfdffffff)
+ * - RAM (generally 0x00000000 -> 0x7fffffff)
+ * - ROM (_ROMBASE -> _ROMBASE + ROM_SIZE)
+ * - I/O (generally 0xfc000000 -> 0xfdffffff)
* - the main purpose for setting up the DBATs is so the I/O region
* can be marked cache inhibited/write through
* - set up IBATs for RAM and ROM
@@ -92,18 +92,19 @@
/*
* Set up DBATs
*
- * DBAT0 covers RAM (0 - 256Mb)
- * DBAT1 covers PCI memory and ROM (0xFC000000 - 0xFFFFFFFF)
- * DBAT1 covers PCI memory (0x80000000 - 0x8FFFFFFF)
+ * DBAT0 covers RAM (0 -> 0x0FFFFFFF) (256Mb)
+ * DBAT1 covers PCI memory and ROM (0xFD000000 -> 0xFFFFFFFF) (64Mb)
+ * DBAT2 covers PCI memory (0x80000000 -> 0x8FFFFFFF) (256Mb)
+ * DBAT3 is not used
*/
- lis r2, 0@ha
+ lis r2, 0@h
ori r3, r2, BAT_BL_256M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
- ori r2, r2, BAT_READ_WRITE
+ ori r2, r2, BAT_READ_WRITE | BAT_GUARDED
mtdbatu 0, r3
mtdbatl 0, r2
isync
- lis r2, BSP_IOREGION2@ha
+ lis r2, BSP_IOREGION2@h
ori r3, r2, BAT_BL_64M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
ori r2, r2, BAT_CACHE_INHIBITED | BAT_GUARDED | BAT_READ_WRITE
mtdbatu 1, r3
@@ -111,7 +112,7 @@
isync
lis r2, BSP_IOREGION1@h
- ori r3, r2, BSP_IOMASK1
+ ori r3, r2, BAT_BL_256M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
ori r2, r2, BAT_CACHE_INHIBITED | BAT_GUARDED | BAT_READ_WRITE
mtdbatu 2, r3
mtdbatl 2, r2
@@ -120,59 +121,59 @@
/*
* IBATS
*
- * IBAT0 covers RAM (0 - 256Mb)
- * IBAT1 covers ROM (_ROMBASE - _ROMBASE+16M)
+ * IBAT0 covers RAM (0 -> 256Mb)
+ * IBAT1 covers ROM (_ROMBASE -> _ROMBASE+ROM_SIZE)
*/
- lis r2, 0@ha
+ lis r2, 0@h
ori r3, r2, BAT_BL_256M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
ori r2, r2, BAT_READ_WRITE
mtibatu 0, r3
mtibatl 0, r2
isync
- lis r2, _ROMBASE@ha
+ lis r2, _ROMBASE@h
+#if ROM_SIZE > 1048576
ori r3, r2, BAT_BL_16M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
+#else
+ ori r3, r2, BAT_BL_1M | BAT_VALID_SUPERVISOR | BAT_VALID_USER
+#endif
ori r2, r2, BAT_READ_ONLY
mtibatu 1, r3
mtibatl 1, r2
isync
- /*
- * Invalidate tlb entries
- */
- lis r3, 0
- lis r5, 0x4
- isync
-tlblp:
- tlbie r3
- sync
- addi r3, r3, 0x1000
- cmp 0, 0, r3, r5
- blt tlblp
-
- sync
-
/*
* Enable MMU
*/
mfmsr r2
ori r2, r2, MSR_DR | MSR_IR
- isync
mtmsr r2
isync
+ sync
/*
- * Enable L1 dcache
+ * Enable and invalidate the L1 icache
*/
mfspr r2, HID0
- ori r2, r2, HID0_DCE | HID0_DCFI
- sync
+ ori r2, r2, HID0_ICE | HID0_ICFI
+ isync
mtspr HID0, r2
-
/*
- * Enable L1 icache
+ * Enable and invalidate the L1 dcache
*/
mfspr r2, HID0
- ori r2, r2, HID0_ICE | HID0_ICFI
- isync
+ ori r2, r2, HID0_DCE | HID0_DCFI
+ sync
mtspr HID0, r2
+
+ /*
+ * Initialize data cache blocks
+ * (assumes cache block size of 32 bytes)
+ */
+ lis r1, DCACHE_RAM_BASE@h
+ ori r1, r1, DCACHE_RAM_BASE@l
+ li r3, (DCACHE_RAM_SIZE / 32)
+ mtctr r3
+0: dcbz r0, r1
+ addi r1, r1, 32
+ bdnz 0b