From 0d8da6f5436874c1dd987b53d11a3d3aea468f67 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 16 Apr 2024 20:10:07 -0400
Subject: kernel: vm_map: Add mmap() and munmap()

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/proc.h    |  3 +++
 sys/include/sys/syscall.h |  2 ++
 sys/include/vm/map.h      | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+)

(limited to 'sys/include')

diff --git a/sys/include/sys/proc.h b/sys/include/sys/proc.h
index 09aebf5..f74d1da 100644
--- a/sys/include/sys/proc.h
+++ b/sys/include/sys/proc.h
@@ -38,6 +38,7 @@
 #include <machine/frame.h>
 #include <machine/pcb.h>
 #include <vm/vm.h>
+#include <vm/map.h>
 
 #define PROC_MAX_FDS 256
 #define PROC_MAX_ADDR_RANGE 4
@@ -62,6 +63,8 @@ struct proc {
     uint8_t is_user;
     uint32_t signal;
     struct filedesc *fds[PROC_MAX_FDS];
+    struct spinlock mapspace_lock;
+    struct vm_mapspace mapspace;
     TAILQ_ENTRY(proc) link;
 };
 
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index 8ebc2da..59b6036 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -43,6 +43,8 @@ enum {
     SYS_close,
     SYS_read,
     SYS_lseek,
+    SYS_mmap,
+    SYS_munmap,
     __MAX_SYSCALLS
 };
 
diff --git a/sys/include/vm/map.h b/sys/include/vm/map.h
index 078a5e8..f482788 100644
--- a/sys/include/vm/map.h
+++ b/sys/include/vm/map.h
@@ -32,11 +32,49 @@
 
 #include <sys/types.h>
 #include <sys/cdefs.h>
+#include <sys/queue.h>
+#include <sys/syscall.h>
+#include <sys/spinlock.h>
 #include <vm/pmap.h>
+#include <vm/vm.h>
+
+#define MAP_SHARED      0x0001
+#define MAP_PRIVATE     0x0002
+#define MAP_ANONYMOUS   0x0010
+#define MAP_FAILED      ((void *)-1)
+
+/* Memory map table entry count */
+#define MTAB_ENTRIES 32
+
+struct vm_mapping {
+    TAILQ_ENTRY(vm_mapping) link;
+    struct vm_range range;
+    paddr_t physmem_base;
+
+    /* Private */
+    size_t vhash;           /* Virtual address hash */
+};
+
+typedef TAILQ_HEAD(, vm_mapping) vm_mapq_t;
+
+struct vm_mapspace {
+    vm_mapq_t mtab[MTAB_ENTRIES];   /* Map table */
+    size_t map_count;
+};
+
 
 int vm_map_create(struct vas vas, vaddr_t va, paddr_t pa, vm_prot_t prot,
                   size_t bytes);
 
 int vm_map_destroy(struct vas vas, vaddr_t va, size_t bytes);
 
+uint64_t sys_mmap(struct syscall_args *args);
+uint64_t sys_munmap(struct syscall_args *args);
+
+/* Mapespace operations */
+void vm_mapspace_insert(struct vm_mapspace *ms, struct vm_mapping *mapping);
+void vm_mapspace_remove(struct vm_mapspace *ms, struct vm_mapping *mapping);
+struct vm_mapping *vm_mapping_fetch(struct vm_mapspace *ms, vaddr_t va);
+void vm_free_mapq(vm_mapq_t *mapq);
+
 #endif  /* !_VM_MMAP_H_ */
-- 
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