From: Ben Gras <ben@minix3.org>
Date: Tue, 29 Jan 2013 17:52:08 +0000 (+0000)
Subject: vm: fix kernel-requested mappings for arm
X-Git-Tag: v3.2.1~49
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=08cb986d3fe8559c81ae5b3b6faa41bef5ef4701;p=minix.git

vm: fix kernel-requested mappings for arm

	. make vm tell kernel virtual locations of mappings
	. makes _minix_kerninfo feature work
	. fix for mappings being larger than what 1 pde can address
	  (e.g. devices memory requested on arm)
	. still requires a special case for devices memory for the
	  kernel, which has to switch to virtual addressing

Change-Id: I2e94090aa432346fa4da0edeba72f0b7406c2ad7
---

diff --git a/lib/libc/sys-minix/init.c b/lib/libc/sys-minix/init.c
index a515761ea..544a60d53 100644
--- a/lib/libc/sys-minix/init.c
+++ b/lib/libc/sys-minix/init.c
@@ -19,9 +19,6 @@ struct minix_ipcvecs _minix_ipcvecs = {
 
 void __minix_init(void)
 {
-#ifdef __arm__
-	_minix_kerninfo = NULL;
-#else
 	if((_minix_kernel_info_struct(&_minix_kerninfo)) != 0
 	  || _minix_kerninfo->kerninfo_magic != KERNINFO_MAGIC) {
 		_minix_kerninfo = NULL;
@@ -29,6 +26,5 @@ void __minix_init(void)
          	_minix_kerninfo->minix_ipcvecs) {
 		_minix_ipcvecs = *_minix_kerninfo->minix_ipcvecs;
          }
-#endif /* __arm__ */
 }
 
diff --git a/servers/vm/arch/i386/pagetable.c b/servers/vm/arch/i386/pagetable.c
index 660e91178..0d51fd2ba 100644
--- a/servers/vm/arch/i386/pagetable.c
+++ b/servers/vm/arch/i386/pagetable.c
@@ -646,7 +646,9 @@ int pt_ptalloc_in_range(pt_t *pt, vir_bytes start, vir_bytes end,
 				 */
 				return r;
 			}
+			assert(pt->pt_pt[pde]);
 		}
+		assert(pt->pt_pt[pde]);
 		assert(pt->pt_dir[pde]);
 		assert(pt->pt_dir[pde] & ARCH_VM_PDE_PRESENT);
 	}
@@ -1215,17 +1217,14 @@ void pt_init(void)
 
 		while(sys_vmctl_get_mapping(index, &addr, &len,
 			&flags) == OK)  {
+			int usedpde;
 			vir_bytes vir;
 			if(index >= MAX_KERNMAPPINGS)
                 		panic("VM: too many kernel mappings: %d", index);
 			kern_mappings[index].phys_addr = addr;
 			kern_mappings[index].len = len;
 			kern_mappings[index].flags = flags;
-#if defined(__i386__)
 			kern_mappings[index].vir_addr = offset;
-#elif defined(__arm__)
-			kern_mappings[index].vir_addr = addr;
-#endif
 			kern_mappings[index].flags =
 				ARCH_VM_PTE_PRESENT;
 			if(flags & VMMF_UNCACHED)
@@ -1262,6 +1261,17 @@ void pt_init(void)
 			offset += len;
 			index++;
 			kernmappings++;
+
+#if defined(__i386__)
+			usedpde = I386_VM_PDE(offset);
+#elif defined(__arm__)
+			usedpde = ARM_VM_PDE(offset);
+#endif
+			while(usedpde > kernmap_pde) {
+				int newpde = freepde();
+				assert(newpde == kernmap_pde+1);
+				kernmap_pde = newpde;
+			}
 		}
 	}
 
@@ -1474,6 +1484,18 @@ int pt_mapkernel(pt_t *pt)
 			kern_mappings[i].flags, 0)) != OK) {
 			return r;
 		}
+
+#if defined(__arm__)
+		if(kern_mappings[i].phys_addr == 0x48000000) {
+			if((r=pt_writemap(NULL, pt,
+				kern_mappings[i].phys_addr,
+				kern_mappings[i].phys_addr,
+				kern_mappings[i].len,
+				kern_mappings[i].flags, 0)) != OK) {
+				return r;
+			}
+		}
+#endif
 	}
 
 	return OK;