X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/b0d623f7f2ae71ed96e60569f61f9a9a27016e80..d26ffc64f583ab2d29df48f13518685602bc8832:/osfmk/i386/phys.c

diff --git a/osfmk/i386/phys.c b/osfmk/i386/phys.c
index c8a2f5206..49147fc2a 100644
--- a/osfmk/i386/phys.c
+++ b/osfmk/i386/phys.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -54,7 +54,6 @@
  * the rights to redistribute these changes.
  */
 
-#include <mach_rt.h>
 #include <mach_debug.h>
 #include <mach_ldebug.h>
 
@@ -156,26 +155,11 @@ pmap_copy_part_lpage(
 	__unused vm_offset_t	dst_offset,
 	__unused vm_size_t	len)
 {
-#ifdef __i386__
-        mapwindow_t *map;
-#endif
 
 	assert(pdst != vm_page_fictitious_addr);
 	assert(pdst != vm_page_guard_addr);
 	assert((dst_offset + len) <= PAGE_SIZE);
 
-#ifdef __i386__
-        mp_disable_preemption();
-
-        map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(pdst) & PG_FRAME) | 
-                                 INTEL_PTE_REF | INTEL_PTE_MOD);
-
-	memcpy((void *) (map->prv_CADDR + (dst_offset & INTEL_OFFMASK)), (void *) src, len);
-
-	pmap_put_mapwindow(map);
-
-	mp_enable_preemption();
-#endif
 }
 
 /*
@@ -189,26 +173,11 @@ pmap_copy_part_rpage(
 	__unused vm_offset_t	dst,
 	__unused vm_size_t	len)
 {
-#ifdef __i386__
-        mapwindow_t *map;
-#endif
 
 	assert(psrc != vm_page_fictitious_addr);
 	assert(psrc != vm_page_guard_addr);
 	assert((src_offset + len) <= PAGE_SIZE);
 
-#ifdef __i386__
-        mp_disable_preemption();
-
-        map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(psrc) & PG_FRAME) | 
-                                 INTEL_PTE_REF);
-
-	memcpy((void *) dst, (void *) (map->prv_CADDR + (src_offset & INTEL_OFFMASK)), len);
-
-	pmap_put_mapwindow(map);
-
-	mp_enable_preemption();
-#endif
 }
 
 /*
@@ -229,8 +198,16 @@ kvtophys(
 	return ((addr64_t)pa);
 }
 
-__private_extern__ void ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes) {
+extern pt_entry_t *debugger_ptep;
+extern vm_map_offset_t debugger_window_kva;
+extern int _bcopy(const void *, void *, vm_size_t);
+extern int _bcopy2(const void *, void *);
+extern int _bcopy4(const void *, void *);
+extern int _bcopy8(const void *, void *);
+
+__private_extern__ int ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes) {
 	void *src, *dst;
+	int err = 0;
 
 	mp_disable_preemption();
 #if NCOPY_WINDOWS > 0
@@ -241,35 +218,73 @@ __private_extern__ void ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t b
 	src = (void *) ((uintptr_t)src_map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK));
 	dst = (void *) ((uintptr_t)dst_map->prv_CADDR | ((uint32_t)dst64 & INTEL_OFFMASK));
 #elif defined(__x86_64__)
-	src = PHYSMAP_PTOV(src64);
-	dst = PHYSMAP_PTOV(dst64);
+	addr64_t debug_pa = 0;
+
+	/* If either destination or source are outside the
+	 * physical map, establish a physical window onto the target frame.
+	 */
+	assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
+
+	if (physmap_enclosed(src64) == FALSE) {
+		src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
+		dst = PHYSMAP_PTOV(dst64);
+		debug_pa = src64 & PG_FRAME;
+	} else if (physmap_enclosed(dst64) == FALSE) {
+		src = PHYSMAP_PTOV(src64);
+		dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
+		debug_pa = dst64 & PG_FRAME;
+	} else {
+		src = PHYSMAP_PTOV(src64);
+		dst = PHYSMAP_PTOV(dst64);
+	}
+	/* DRK: debugger only routine, we don't bother checking for an
+	 * identical mapping.
+	 */
+	if (debug_pa) {
+		if (debugger_window_kva == 0)
+			panic("%s: invoked in non-debug mode", __FUNCTION__);
+		/* Establish a cache-inhibited physical window; some platforms
+		 * may not cover arbitrary ranges with MTRRs
+		 */
+		pmap_store_pte(debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF| INTEL_PTE_MOD | INTEL_PTE_VALID);
+		flush_tlb_raw();
+#if	DEBUG
+		kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
+#endif
+	}
 #endif
 	/* ensure we stay within a page */
 	if (((((uint32_t)src64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) ) {
 	        panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
 	}
 
+	/*
+	 * For device register access from the debugger,
+	 * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
+	 * by assembly routines ensuring the required access widths.
+	 * 1-byte and other copies are handled by the regular _bcopy.
+	 */
 	switch (bytes) {
-	case 1:
-		*((uint8_t *) dst) = *((uint8_t *) src);
-		break;
 	case 2:
-		*((uint16_t *) dst) = *((uint16_t *) src);
+		err = _bcopy2(src, dst);
 		break;
 	case 4:
-		*((uint32_t *) dst) = *((uint32_t *) src);
+		err = _bcopy4(src, dst);
 		break;
-		/* Should perform two 32-bit reads */
 	case 8:
-		*((uint64_t *) dst) = *((uint64_t *) src);
+		err = _bcopy8(src, dst);
 		break;
+	case 1:
 	default:
-		bcopy(src, dst, bytes);
+		err = _bcopy(src, dst, bytes);
 		break;
 	}
+
 #if NCOPY_WINDOWS > 0
 	pmap_put_mapwindow(src_map);
 	pmap_put_mapwindow(dst_map);
 #endif
 	mp_enable_preemption();
+
+	return err;
 }