kernel/amd64: machdep: Add processor_free_pcb()

Add routine to deallocate resources within the process control block.

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 14 insertions, 0 deletions

diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c
index 7ad3e6a..fa6c1f5 100644
--- a/sys/arch/amd64/amd64/machdep.c
+++ b/sys/arch/amd64/amd64/machdep.c
@@ -180,6 +180,19 @@ processor_init_pcb(struct proc *proc)
     return 0;
 }
 
+int
+processor_free_pcb(struct proc *proc)
+{
+    struct pcb *pcb = &proc->pcb;
+
+    if (pcb->fpu_state == NULL) {
+        return -1;
+    }
+
+    vm_free_pageframe(VIRT_TO_PHYS(pcb->fpu_state), 1);
+    return 0;
+}
+
 void
 processor_switch_to(struct proc *old_td, struct proc *new_td)
 {
diff --git a/sys/include/sys/machdep.h b/sys/include/sys/machdep.h
index b6edf14..0c06374 100644
--- a/sys/include/sys/machdep.h
+++ b/sys/include/sys/machdep.h
@@ -39,6 +39,7 @@
 #define MAXCPUS 32
 
 int processor_init_pcb(struct proc *proc);
+int processor_free_pcb(struct proc *proc);
 void processor_switch_to(struct proc *old_td, struct proc *new_td);
 void processor_init(void);
 void processor_halt(void);