From c9a1266d219a83882735a3a8304f3824e0219cdb Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Mon, 15 Jan 2024 15:44:20 -0500
Subject: redo application paging and system calls, rename mercury to hilbert

---
 kernel/paging.cpp | 37 ++++++++++---------------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

(limited to 'kernel/paging.cpp')

diff --git a/kernel/paging.cpp b/kernel/paging.cpp
index 17b61f4..d8869fc 100644
--- a/kernel/paging.cpp
+++ b/kernel/paging.cpp
@@ -1,5 +1,5 @@
-#include <mercury/kernel/utility.hpp>
-#include <mercury/kernel/paging.hpp>
+#include <hilbert/kernel/utility.hpp>
+#include <hilbert/kernel/paging.hpp>
 
 //see also ../documentation/memory.txt
 
@@ -7,7 +7,7 @@ extern "C" {
   uint64_t __kernel_p4_paddr;
 }
 
-namespace mercury::kernel::paging {
+namespace hilbert::kernel::paging {
 
   static constexpr uint64_t kernel_vram_start = 0xffffffffc0000000;
   static constexpr uint64_t kernel_vram_end = 0xffffffffffe00000;
@@ -38,11 +38,9 @@ namespace mercury::kernel::paging {
 
   uint64_t kernel_p4e;
 
-  uint64_t encode_pte(
-    uint64_t addr, bool user, bool write, bool execute, bool ps
-  ) {
+  uint64_t encode_pte(uint64_t addr, bool user, bool write, bool execute) {
     return (addr & 0x0000ffffffffffff) | (execute ? 0 : (1ULL << 63))
-         | (ps << 7) | (user << 2) | (write << 1) | 1;
+         | (user << 2) | (write << 1) | 1;
   }
 
   void init_kernel_page_tables(uint64_t kernel_offset) {
@@ -50,15 +48,15 @@ namespace mercury::kernel::paging {
     for (int i = 0; i < 511; ++i)
       kernel_p4[i] = 0;
     kernel_p4e = encode_pte(
-      (uint64_t)kernel_p3 - kernel_offset, false, true, true, false);
+      (uint64_t)kernel_p3 - kernel_offset, false, true, true);
     kernel_p4[511] = kernel_p4e;
     for (int i = 0; i < 511; ++i)
       kernel_p3[i] = 0;
     kernel_p3[511] = encode_pte(
-      (uint64_t)kernel_p2 - kernel_offset, false, true, true, false);
+      (uint64_t)kernel_p2 - kernel_offset, false, true, true);
     for (int i = 0; i < 512; ++i)
       kernel_p2[i] = encode_pte(
-        (uint64_t)kernel_p1s + 4096 * i - kernel_offset, false, true, true, false);
+        (uint64_t)kernel_p1s + 4096 * i - kernel_offset, false, true, true);
     for (int i = 0; i < 512 * 512; ++i)
       kernel_p1s[i] = 0;
   }
@@ -66,7 +64,7 @@ namespace mercury::kernel::paging {
   void map_kernel_page(
       uint64_t paddr, uint64_t vaddr, bool write, bool execute) {
     uint64_t i = (vaddr - kernel_vram_start) / 4096;
-    kernel_p1s[i] = encode_pte(paddr, false, write, execute, false);
+    kernel_p1s[i] = encode_pte(paddr, false, write, execute);
   }
 
   void unmap_kernel_page(uint64_t vaddr) {
@@ -77,7 +75,7 @@ namespace mercury::kernel::paging {
     );
   }
 
-  static uint64_t take_pram_page() {
+  uint64_t take_pram_page() {
     for (uint64_t i = 0; i < pram_pages / 64; ++i)
       if (~pram_usage_bitmap[i] != 0)
         for (int j = 0; j < 64; ++j)
@@ -89,21 +87,6 @@ namespace mercury::kernel::paging {
     return 0;
   }
 
-  uint64_t take_2mib_pram_page() {
-    for (uint64_t i = 0; i < pram_pages / 512; ++i) {
-      for (int j = 0; j < 8; ++j)
-        if (pram_usage_bitmap[i * 8 + j] != 0)
-          goto next_i;
-      for (int j = 0; j < 8; ++j)
-        pram_usage_bitmap[i * 8 + j] = ~0ULL;
-      return 0x200000 * i;
-    next_i:
-      ;
-    }
-    //TODO: handle error
-    return 0;
-  }
-
   void map_kernel_stacks() {
     for (uint64_t vaddr = syscall_stack_bottom;
          vaddr < syscall_stack_top; vaddr += 4096)
-- 
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