From 16624a0cfdc7ffd8db0c24cfd33f47482a08f21e Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Wed, 7 Feb 2024 23:15:56 +0100
Subject: [PATCH] zero: finish implementation

---
 drivers/zero.c | 36 +++++++++++++++++++++++++-----------
 1 file changed, 25 insertions(+), 11 deletions(-)

diff --git a/drivers/zero.c b/drivers/zero.c
index 9610658..60235a6 100644
--- a/drivers/zero.c
+++ b/drivers/zero.c
@@ -1,27 +1,41 @@
-#include "alloc.h"
-#include "klibc.h"
 #include "zero.h"
 
+#include "alloc.h"
+#include "kernel.h"
+#include "klibc.h"
+
 struct zeroMappedEntry {
-        int refCnt;
+    int refCnt;
 };
 
 static int zeroOpen(struct uAddrVirtualReg *vreg)
 {
-        (void)vreg;
-        return 0;
+    struct zeroMappedEntry *ent = (struct zeroMappedEntry *)vreg->res->customData;
+    ent->refCnt++;
+    return 0;
 }
+
 static int zeroClose(struct uAddrVirtualReg *vreg)
 {
-        (void)vreg;
-        return 0;
+    struct zeroMappedEntry *ent = (struct zeroMappedEntry *)vreg->res->customData;
+    ent->refCnt--;
+    return 0;
 }
+
 static int zeroNoPage(struct uAddrVirtualReg *vreg, uaddr_t addr, int right)
 {
-        (void)vreg;
-        (void)addr;
-        (void)right;
-        return 0;
+    (void)vreg;
+
+    int ret       = 0;
+    paddr_t ppage = allocPhyPage(1);
+    ret           = pageMap(ALIGN_DOWN(addr, PAGE_SIZE), ppage, right | PAGING_MEM_USER) ;
+
+    unrefPhyPage(ppage);
+    if (ret) {
+        return ret;
+    }
+    memset((void *)ALIGN_DOWN(addr, PAGE_SIZE), 0, PAGE_SIZE);
+    return ret;
 }
 
 static struct mappedRessourceOps zeroOps = {