1 files changed, 0 insertions, 145 deletions
diff --git a/kernel/paging.cpp b/kernel/paging.cpp
deleted file mode 100644
index d8869fc..0000000
--- a/kernel/paging.cpp
+++ /dev/null
@@ -1,145 +0,0 @@
-#include <hilbert/kernel/utility.hpp>
-#include <hilbert/kernel/paging.hpp>
-
-//see also ../documentation/memory.txt
-
-extern "C" {
-  uint64_t __kernel_p4_paddr;
-}
-
-namespace hilbert::kernel::paging {
-
-  static constexpr uint64_t kernel_vram_start = 0xffffffffc0000000;
-  static constexpr uint64_t kernel_vram_end = 0xffffffffffe00000;
-  static constexpr uint64_t kernel_vram_pages =
-    (kernel_vram_end - kernel_vram_start) / 4096;
-  static constexpr uint64_t syscall_stack_bottom = 0xfffffffffff01000;
-  static constexpr uint64_t syscall_stack_top = 0xfffffffffffff000;
-  static constexpr uint64_t interrupt_stack_bottom = 0xffffffffffe01000;
-  static constexpr uint64_t interrupt_stack_top = 0xffffffffffeff000;
-
-  static constexpr uint64_t pram_pages = 1 << 23;
-  static uint64_t pram_usage_bitmap[pram_pages / 64];
-
-  void mark_all_pram_used() {
-    utility::mark_bitmap_region_one(pram_usage_bitmap, 0, pram_pages);
-  }
-
-  void mark_pram_region_free(uint64_t start_addr, uint64_t end_addr) {
-    utility::mark_bitmap_region_zero(
-      pram_usage_bitmap, start_addr / 4096,
-      utility::min(end_addr / 4096, pram_pages));
-  }
-
-  [[gnu::aligned(4096)]] uint64_t kernel_p4[512];
-  [[gnu::aligned(4096)]] uint64_t kernel_p3[512];
-  [[gnu::aligned(4096)]] uint64_t kernel_p2[512];
-  [[gnu::aligned(4096)]] uint64_t kernel_p1s[512 * 512];
-
-  uint64_t kernel_p4e;
-
-  uint64_t encode_pte(uint64_t addr, bool user, bool write, bool execute) {
-    return (addr & 0x0000ffffffffffff) | (execute ? 0 : (1ULL << 63))
-         | (user << 2) | (write << 1) | 1;
-  }
-
-  void init_kernel_page_tables(uint64_t kernel_offset) {
-    __kernel_p4_paddr = (uint64_t)kernel_p4 - kernel_offset;
-    for (int i = 0; i < 511; ++i)
-      kernel_p4[i] = 0;
-    kernel_p4e = encode_pte(
-      (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);
-    for (int i = 0; i < 512; ++i)
-      kernel_p2[i] = encode_pte(
-        (uint64_t)kernel_p1s + 4096 * i - kernel_offset, false, true, true);
-    for (int i = 0; i < 512 * 512; ++i)
-      kernel_p1s[i] = 0;
-  }
-
-  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);
-  }
-
-  void unmap_kernel_page(uint64_t vaddr) {
-    uint64_t i = (vaddr - kernel_vram_start) / 4096;
-    kernel_p1s[i] = 0;
-    asm volatile (
-      "mov %%cr3, %%rax\nmov %%rax, %%cr3" ::: "%rax"
-    );
-  }
-
-  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)
-          if (~pram_usage_bitmap[i] & (1ULL << j)) {
-            pram_usage_bitmap[i] |= (1ULL << j);
-            return 4096 * (i * 64 + j);
-          }
-    //TODO: handle error
-    return 0;
-  }
-
-  void map_kernel_stacks() {
-    for (uint64_t vaddr = syscall_stack_bottom;
-         vaddr < syscall_stack_top; vaddr += 4096)
-      map_kernel_page(take_pram_page(), vaddr, true, false);
-    for (uint64_t vaddr = interrupt_stack_bottom;
-         vaddr < interrupt_stack_top; vaddr += 4096)
-      map_kernel_page(take_pram_page(), vaddr, true, false);
-  }
-
-  uint64_t find_unmapped_vram_region(uint64_t page_count) {
-    uint64_t start = 0;
-    uint64_t len = 0;
-    for (uint64_t i = 0; i < kernel_vram_pages; ++i)
-      if (kernel_p1s[i] == 0) {
-        ++len;
-        if (len == page_count)
-          return start * 4096 + kernel_vram_start;
-      }
-      else {
-        start = i + 1;
-        len = 0;
-      }
-    //TODO: handle error
-    return 0;
-  }
-
-  void *map_new_kernel_pages(uint64_t count) {
-    uint64_t vaddr = find_unmapped_vram_region(count);
-    for (uint64_t i = 0; i < count; ++i)
-      map_kernel_page(take_pram_page(), vaddr + i * 4096, true, false);
-    return (void *)vaddr;
-  }
-
-  void map_new_kernel_page(uint64_t &vaddr_out, uint64_t &paddr_out) {
-    vaddr_out = find_unmapped_vram_region(1);
-    paddr_out = take_pram_page();
-    map_kernel_page(paddr_out, vaddr_out, true, false);
-  }
-
-  uint64_t get_used_vram_page_count() {
-    uint64_t count = 0;
-    for (uint64_t i = 0; i < kernel_vram_pages; ++i)
-      if (kernel_p1s[i] != 0)
-        ++count;
-    return count;
-  }
-
-  uint64_t get_free_pram_page_count() {
-    uint64_t used_count = 0;
-    for (uint64_t i = 0; i < pram_pages / 64; ++i)
-      for (uint64_t j = 0; j < 64; ++j)
-        used_count += (pram_usage_bitmap[i] >> j) & 1;
-    return pram_pages - used_count;
-  }
-
-}