---

yaml --- r: 81198 b: refs/heads/master c: f4151b9 h: refs/heads/master v: v3
git-mirror · Dec 23, 2007 · 4ca9610 · 4ca9610
1 parent 65947d8
commit 4ca9610
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Showing 4 changed files with 24 additions and 37 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4922566f0394ac41c72fb960f22b4f84333026bc
+refs/heads/master: f4151b9ba87901eb3a7bc49f418cc352d4e1927e
diff --git a/trunk/arch/ppc/kernel/head_44x.S b/trunk/arch/ppc/kernel/head_44x.S
@@ -195,7 +195,7 @@ skpinv:	addi	r4,r4,1				/* Increment */
 	li	r5,0
 	ori	r5,r5,(PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_I | PPC44x_TLB_G)
 
-        li      r0,0                    /* TLB slot 0 */
+	li	r0,62			/* TLB slot 62 */
 
 	tlbwe	r3,r0,PPC44x_TLB_PAGEID	/* Load the pageid fields */
 	tlbwe	r4,r0,PPC44x_TLB_XLAT	/* Load the translation fields */

diff --git a/trunk/arch/ppc/mm/44x_mmu.c b/trunk/arch/ppc/mm/44x_mmu.c
@@ -60,61 +60,42 @@ extern char etext[], _stext[];
  * Just needed it declared someplace.
  */
 unsigned int tlb_44x_index = 0;
-unsigned int tlb_44x_hwater = 62;
+unsigned int tlb_44x_hwater = PPC4XX_TLB_SIZE - 1 - PPC44x_EARLY_TLBS;
 int icache_44x_need_flush;
 
 /*
  * "Pins" a 256MB TLB entry in AS0 for kernel lowmem
  */
-static void __init
-ppc44x_pin_tlb(int slot, unsigned int virt, unsigned int phys)
+static void __init ppc44x_pin_tlb(unsigned int virt, unsigned int phys)
 {
-	unsigned long attrib = 0;
-
-	__asm__ __volatile__("\
-	clrrwi	%2,%2,10\n\
-	ori	%2,%2,%4\n\
-	clrrwi	%1,%1,10\n\
-	li	%0,0\n\
-	ori	%0,%0,%5\n\
-	tlbwe	%2,%3,%6\n\
-	tlbwe	%1,%3,%7\n\
-	tlbwe	%0,%3,%8"
+	__asm__ __volatile__(
+		"tlbwe	%2,%3,%4\n"
+		"tlbwe	%1,%3,%5\n"
+		"tlbwe	%0,%3,%6\n"
 	:
-	: "r" (attrib), "r" (phys), "r" (virt), "r" (slot),
-	  "i" (PPC44x_TLB_VALID | PPC44x_TLB_256M),
-	  "i" (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G),
+	: "r" (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G),
+	  "r" (phys),
+	  "r" (virt | PPC44x_TLB_VALID | PPC44x_TLB_256M),
+	  "r" (tlb_44x_hwater--), /* slot for this TLB entry */
 	  "i" (PPC44x_TLB_PAGEID),
 	  "i" (PPC44x_TLB_XLAT),
 	  "i" (PPC44x_TLB_ATTRIB));
 }
 
-/*
- * MMU_init_hw does the chip-specific initialization of the MMU hardware.
- */
 void __init MMU_init_hw(void)
 {
 	flush_instruction_cache();
 }
 
 unsigned long __init mmu_mapin_ram(void)
 {
-	unsigned int pinned_tlbs = 1;
-	int i;
-
-	/* Determine number of entries necessary to cover lowmem */
-	pinned_tlbs = (unsigned int)
-		(_ALIGN(total_lowmem, PPC_PIN_SIZE) >> PPC44x_PIN_SHIFT);
-
-	/* Write upper watermark to save location */
-	tlb_44x_hwater = PPC44x_LOW_SLOT - pinned_tlbs;
+	unsigned long addr;
 
-	/* If necessary, set additional pinned TLBs */
-	if (pinned_tlbs > 1)
-		for (i = (PPC44x_LOW_SLOT-(pinned_tlbs-1)); i < PPC44x_LOW_SLOT; i++) {
-			unsigned int phys_addr = (PPC44x_LOW_SLOT-i) * PPC_PIN_SIZE;
-			ppc44x_pin_tlb(i, phys_addr+PAGE_OFFSET, phys_addr);
-		}
+	/* Pin in enough TLBs to cover any lowmem not covered by the
+	 * initial 256M mapping established in head_44x.S */
+	for (addr = PPC_PIN_SIZE; addr < total_lowmem;
+	     addr += PPC_PIN_SIZE)
+		ppc44x_pin_tlb(addr + PAGE_OFFSET, addr);
 
 	return total_lowmem;
 }
diff --git a/trunk/include/asm-ppc/mmu.h b/trunk/include/asm-ppc/mmu.h
@@ -383,6 +383,12 @@ typedef struct _P601_BAT {
 #define BOOKE_PAGESZ_256GB	14
 #define BOOKE_PAGESZ_1TB	15
 
+#ifndef CONFIG_SERIAL_TEXT_DEBUG
+#define PPC44x_EARLY_TLBS	1
+#else
+#define PPC44x_EARLY_TLBS	2
+#endif
+
 /*
  * Freescale Book-E MMU support
  */