9os

commit 43be64fccc4807ec2802d7424818d6392e2c38e8
parent 9469372d1915f951022b6e83a77cfa02cd5d0419
Author: Roberto E. Vargas Caballero <roberto.vargas@midokura.com>
Date:   Sat, 19 Nov 2022 08:26:25 +0100

os9: Add unmapseg()

This function is needed if we want to unmap a segment, that is
for example needed in rfork or when a task is destroyed.

Diffstat:
M
include/os9/os9.h
 | 
1
+
M
src/os9/arch/arm64/mmu.c
 | 
10
++++++++++
M
src/os9/hosted/mmu.c
 | 
7
+++++++
M
src/os9/proc.c
 | 
13
+++++++++++++

4 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/include/os9/os9.h b/include/os9/os9.h
@@ -279,6 +279,7 @@ extern int debug(void);
 
 /* arch mmu.c */
 extern int vmap(phyaddr_t, uintptr_t, int);
+extern int vunmap(phyaddr_t);
 
 /* arch functions */
 extern Context *getctx(Context *ctx);
diff --git a/src/os9/arch/arm64/mmu.c b/src/os9/arch/arm64/mmu.c
@@ -261,6 +261,16 @@ vmap(phyaddr_t pa, uintptr_t va, int perm)
 	return 0;
 }
 
+
+int
+vunmap(phyaddr_t pa)
+{
+	/& TODO */
+        return 0;
+}
+
+
+
 void
 taskmap(void)
 {
diff --git a/src/os9/hosted/mmu.c b/src/os9/hosted/mmu.c
@@ -9,6 +9,13 @@ vmap(phyaddr_t pa, uintptr_t va, int flags)
 	return 0;
 }
 
+int
+vunmap(phyaddr_t pa)
+{
+	dbg("vunmap %llx\n", (long long) pa);
+	return 0;
+}
+
 Ptable *
 initptable(Task *tp)
 {
diff --git a/src/os9/proc.c b/src/os9/proc.c
@@ -110,6 +110,19 @@ gettask(int pid)
 int
 unmapseg(Map *mp)
 {
+	Page *p;
+
+	dbg("unmap %s: %llx -> %llx\n",
+	    (mp->name) ? mp->name : "unnamed",
+	    mp->va, mp->pa);
+
+	for (p = mp->pages; p; p = p->next) {
+		vunmap(p->pa);
+		freep(p);
+	}
+
+	mp->pages = NULL;
+
 	return 0;
 }