Move is_memory_range() from mips64 mem.c to a per-architecture location; this

allows /dev/kmem to access the 256MB alias of the low memory on loongson, which
in turns makes procmap(8) happy.

2 files changed, 55 insertions, 21 deletions

diff --git a/sys/arch/loongson/dev/bonito.c b/sys/arch/loongson/dev/bonito.c
index e8b614c1e05..9d46d4ad68b 100644
--- a/sys/arch/loongson/dev/bonito.c
+++ b/sys/arch/loongson/dev/bonito.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bonito.c,v 1.1 2009/12/25 22:09:45 miod Exp $	*/
+/*	$OpenBSD: bonito.c,v 1.2 2010/01/22 21:45:22 miod Exp $	*/
 /*	$NetBSD: bonito_mainbus.c,v 1.11 2008/04/28 20:23:10 martin Exp $	*/
 /*	$NetBSD: bonito_pci.c,v 1.5 2008/04/28 20:23:28 martin Exp $	*/
 
@@ -300,13 +300,13 @@ bonito_attach(struct device *parent, struct device *self, void *aux)
 bus_addr_t
 bonito_pa_to_device(paddr_t pa)
 {
-	return pa;
+	return pa ^ loongson_dma_base;
 }
 
 paddr_t
 bonito_device_to_pa(bus_addr_t addr)
 {
-	return addr;
+	return addr ^ loongson_dma_base;
 }
 
 int
diff --git a/sys/arch/loongson/loongson/loongson2_machdep.c b/sys/arch/loongson/loongson/loongson2_machdep.c
index 67a26098d2a..541ef74c63e 100644
--- a/sys/arch/loongson/loongson/loongson2_machdep.c
+++ b/sys/arch/loongson/loongson/loongson2_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: loongson2_machdep.c,v 1.1 2009/12/25 22:04:21 miod Exp $	*/
+/*	$OpenBSD: loongson2_machdep.c,v 1.2 2010/01/22 21:45:24 miod Exp $	*/
 
 /*
  * Copyright (c) 2009 Miodrag Vallat.
@@ -30,6 +30,7 @@
 
 extern struct phys_mem_desc mem_layout[MAXMEMSEGS];
 
+boolean_t is_memory_range(paddr_t, psize_t, psize_t);
 void	loongson2e_setup(u_long, u_long);
 void	loongson2f_setup(u_long, u_long);
 
@@ -42,23 +43,6 @@ paddr_t loongson_dma_base = 0;
  * Setup memory mappings for Loongson 2E processors.
  */
 
-void
-loongson2e_setup(u_long memlo, u_long memhi)
-{
-	memlo = atop(memlo << 20);
-	memhi = atop(memhi << 20);
-	physmem = memlo + memhi;
-
-	/*
-	 * Only register the first 256MB of memory.
-	 * This will be hopefully be revisited once we get our hands
-	 * on Loongson 2E-based hardware...
-	 */
-
-	mem_layout[0].mem_first_page = 1; /* do NOT stomp on exception area */
-	mem_layout[0].mem_last_page = memlo;
-}
-
 /*
  * Canonical crossbow assignments on Loongson 2F based designs.
  * Might need to move to a per-design header file in the future.
@@ -84,6 +68,25 @@ loongson2e_setup(u_long memlo, u_long memhi)
 #define	PCI_DDR_SIZE		DDR_PHYSICAL_SIZE
 #define	PCI_DDR_WINDOW_BASE	DDR_PHYSICAL_BASE
 
+void
+loongson2e_setup(u_long memlo, u_long memhi)
+{
+	memlo = atop(memlo << 20);
+	memhi = atop(memhi << 20);
+	physmem = memlo + memhi;
+
+	/*
+	 * Only register the first 256MB of memory.
+	 * This will be hopefully be revisited once we get our hands
+	 * on Loongson 2E-based hardware...
+	 */
+
+	mem_layout[0].mem_first_page = 1; /* do NOT stomp on exception area */
+	mem_layout[0].mem_last_page = memlo;
+
+	loongson_dma_base = PCI_DDR_BASE;
+}
+
 /*
  * Setup memory mappings for Loongson 2F processors.
  */
@@ -160,3 +163,34 @@ loongson2f_setup(u_long memlo, u_long memhi)
 	*awrreg = DDR_PHYSICAL_BASE | MASTER_CPU;
 	(void)*awrreg;
 }
+
+boolean_t
+is_memory_range(paddr_t pa, psize_t len, psize_t limit)
+{
+	struct phys_mem_desc *seg;
+	uint64_t fp, lp;
+	int i;
+
+	fp = atop(pa);
+	lp = atop(round_page(pa + len));
+
+	if (limit != 0 && lp > atop(limit))
+		return FALSE;
+
+	/*
+	 * Allow access to the low 256MB aliased region on 2F systems.
+	 */
+	if (/* curcpu()->ci_hw.type == MIPS_LOONGSON2 && */
+	    (curcpu()->ci_hw.c0prid & 0xff) == 0x2f - 0x2c) {
+		if (pa < 0x10000000) {
+			fp += atop(DDR_WINDOW_BASE);
+			lp += atop(DDR_WINDOW_BASE);
+		}
+	}
+
+	for (i = 0, seg = mem_layout; i < MAXMEMSEGS; i++, seg++)
+		if (fp >= seg->mem_first_page && lp <= seg->mem_last_page)
+			return TRUE;
+
+	return FALSE;
+}