From f004c1ade8d617a82cea2fe249434cccb47a2358 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 19 Mar 2024 13:03:52 -0400
Subject: rename abi to sys. better memory allocation

---
 sys/errno.h      | 10 ++++++++
 sys/permission.h | 11 +++++++++
 sys/syscall.h    | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/types.h      | 32 ++++++++++++++++++++++++++
 4 files changed, 122 insertions(+)
 create mode 100644 sys/errno.h
 create mode 100644 sys/permission.h
 create mode 100644 sys/syscall.h
 create mode 100644 sys/types.h

(limited to 'sys')

diff --git a/sys/errno.h b/sys/errno.h
new file mode 100644
index 0000000..8d0c980
--- /dev/null
+++ b/sys/errno.h
@@ -0,0 +1,10 @@
+#ifndef _SYS_ERRNO_H
+#define _SYS_ERRNO_H 1
+
+#define ENOPERM 1
+#define EFAULT 2
+#define EINVAL 3
+#define ENOSYS 4
+#define ENOTFOUND 5
+
+#endif
diff --git a/sys/permission.h b/sys/permission.h
new file mode 100644
index 0000000..08bb765
--- /dev/null
+++ b/sys/permission.h
@@ -0,0 +1,11 @@
+#ifndef _SYS_PERMISSION_H
+#define _SYS_PERMISSION_H 1
+
+#define PERM_MEM_PHYS_RESV 1 /* Reserve physical memory. */
+#define PERM_MEM_PHYS_FREE 2 /* Free physical memory. */
+#define PERM_MEM_PHYS_ALLOC 4 /* Allocate physical memory. */
+
+#define PERM_MEM_VIRT_PD 8 /* Work on any PD. */
+#define PERM_MEM_VIRT_MAP 0x10 /* Map physical memory to virtual memory. */
+
+#endif
diff --git a/sys/syscall.h b/sys/syscall.h
new file mode 100644
index 0000000..d8b64bb
--- /dev/null
+++ b/sys/syscall.h
@@ -0,0 +1,69 @@
+#ifndef _SYS_SYSCALL_H
+#define _SYS_SYSCALL_H 1
+
+#include <stdint.h>
+#include <stddef.h>
+#include "types.h"
+
+typedef struct syscall {
+    int id;
+} syscall_t;
+
+struct syscall_log {
+    syscall_t syscall;
+    const char *message;
+};
+
+struct syscall_mem_phys_range_op {
+    syscall_t syscall;
+    uintptr_t base;
+    uintptr_t limit;
+};
+
+struct syscall_mem_phys_alloc {
+    syscall_t syscall;
+    size_t npages;
+    uintptr_t *result;
+};
+
+struct syscall_mem_virt_mapping {
+    syscall_t syscall;
+    linear_address_t addr;
+    page_mapping_t *result;
+};
+
+struct syscall_mem_virt_map {
+    syscall_t syscall;
+    linear_address_t addr;
+    page_mapping_t map;
+};
+
+struct syscall_mem_virt_alloc {
+    syscall_t syscall;
+    linear_address_t from;
+    uintptr_t to;
+    page_flags_t flg;
+};
+
+enum
+{
+    SYSCALL_LOG = 0,
+    SYSCALL_TID,
+
+    SYSCALL_MEM_PHYS_RESV,
+    SYSCALL_MEM_PHYS_FREE,
+    SYSCALL_MEM_PHYS_ALLOC,
+
+    SYSCALL_MEM_VIRT_MAPPING,
+    SYSCALL_MEM_VIRT_MAP,
+    SYSCALL_MEM_VIRT_ALLOC,
+
+    SYSCALL_COUNT
+};
+
+#define _SYSCALL(data) \
+    intmax_t ax; \
+    __asm__ volatile("movq %0, %%rdi\nsyscall": "=a"(ax): "r"(data): "memory"); \
+    return ax
+
+#endif
diff --git a/sys/types.h b/sys/types.h
new file mode 100644
index 0000000..0a519c5
--- /dev/null
+++ b/sys/types.h
@@ -0,0 +1,32 @@
+#ifndef _SYS_TYPES_H
+#define _SYS_TYPES_H 1
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+typedef intmax_t tid_t;
+
+typedef struct {
+    intmax_t tid;
+    uintmax_t addr;
+} linear_address_t;
+
+typedef uintptr_t physptr_t;
+
+typedef struct page_flags
+{
+    bool present;
+    bool writeable;
+    bool useraccess;
+    bool executable;
+} page_flags_t;
+
+typedef struct page_mapping
+{
+    physptr_t phys;
+    page_flags_t pf;
+} page_mapping_t;
+
+
+#endif
-- 
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