Changeset 2bf4936 in mainline for kernel/arch/sparc64/src/start.S

Timestamp:

2009-04-14T15:50:56Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

47a6708

Parents:

577b531

Message:

On sparc64, do fast indentity mapping only for physical memory.
For addresses above physical memory, such as I/O devices,
fall through to the C miss handler and map the memory noncacheably.
Replace deprecated Bicc instructions with proper Bcc instructions.

File:

• kernel/arch/sparc64/src/start.S (modified) (3 diffs)

kernel/arch/sparc64/src/start.S

@@ -85 +85 @@
         sllx %l5, 13 + (63 - (PHYSMEM_ADDR_SIZE - 1)), %l5
         srlx %l5, 63 - (PHYSMEM_ADDR_SIZE - 1), %l5     
-        
+
         /*
          * Setup basic runtime environment.
@@ -334 +334 @@
         ldx [%g2], %g3
         cmp %g3, %g1
-        bne 2b
+        bne %xcc, 2b
         nop
 
@@ -382 +382 @@
 
 /*
- * This variable is used by the fast_data_MMU_miss trap handler. In runtime, it
- * is further modified to reflect the starting address of physical memory.
- */
+ * The fast_data_access_mmu_miss_data_hi label and the end_of_identity and
+ * kernel_8k_tlb_data_template variables are meant to stay together,
+ * aligned on 16B boundary.
+ */
+.global fast_data_access_mmu_miss_data_hi
+.global end_of_identity 
 .global kernel_8k_tlb_data_template
+
+.align 16
+/*
+ * This label is used by the fast_data_access_MMU_miss trap handler.
+ */
+fast_data_access_mmu_miss_data_hi:
+/*
+ * This variable is used by the fast_data_access_MMU_miss trap handler.
+ * In runtime, it is modified to contain the address of the end of physical
+ * memory.
+ */
+end_of_identity:
+        .quad -1 
+/*
+ * This variable is used by the fast_data_access_MMU_miss trap handler.
+ * In runtime, it is further modified to reflect the starting address of
+ * physical memory.
+ */
 kernel_8k_tlb_data_template:
 #ifdef CONFIG_VIRT_IDX_DCACHE