From a5b7bd8ef23c08a8afa424ce8a5df986c9c3e73e Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Thu, 26 Nov 2020 01:30:35 +0500
Subject: [PATCH] Remove page frame allocator

---
 kernelmq/Makefile |  1 -
 kernelmq/init.c   |  4 ---
 kernelmq/pfa.c    | 86 -----------------------------------------------
 kernelmq/pfa.h    | 18 ----------
 4 files changed, 109 deletions(-)
 delete mode 100644 kernelmq/pfa.c
 delete mode 100644 kernelmq/pfa.h

diff --git a/kernelmq/Makefile b/kernelmq/Makefile
index dbd1c85..85924b3 100644
--- a/kernelmq/Makefile
+++ b/kernelmq/Makefile
@@ -14,7 +14,6 @@ OBJS += main.c.o
 OBJS += init.c.o
 OBJS += multiboot.c.o
 OBJS += panic.c.o  panic.asm.cpp.o
-OBJS += pfa.c.o
 OBJS += paging.c.o paging.asm.cpp.o
 OBJS += page_dir.c.o
 
diff --git a/kernelmq/init.c b/kernelmq/init.c
index 287dae1..2c6aa98 100644
--- a/kernelmq/init.c
+++ b/kernelmq/init.c
@@ -1,5 +1,4 @@
 #include "panic.h"
-#include "pfa.h"
 #include "protected.h"
 #include "paging.h"
 
@@ -19,9 +18,6 @@ void init(const struct KernelMQ_Info *const kinfo_ptr)
 
     assert(kernelmq_info_validate_and_copy(&kinfo, kinfo_ptr), "Invalid kernel information.");
 
-    pfa_initialize(&kinfo);
-    pfa_print_info();
-
     protected_initialize(&kinfo);
 
     // Set up a new post-relocate bootstrap pagetable so that
diff --git a/kernelmq/pfa.c b/kernelmq/pfa.c
deleted file mode 100644
index 9e56d70..0000000
--- a/kernelmq/pfa.c
+++ /dev/null
@@ -1,86 +0,0 @@
-#include "pfa.h"
-
-#include "config.h"
-#include "panic.h"
-#include "logger.h"
-
-#include "stdlib.h"
-
-#define FRAMES_COUNT (PAGE_DIR_LENGTH * PAGE_TABLE_LENGTH)
-
-static unsigned char frames[FRAMES_COUNT];
-
-static void mark_used(unsigned long base, unsigned long limit);
-
-void pfa_initialize(const struct KernelMQ_Info *const kinfo)
-{
-    logger_info_from("pfa", "Initialize page frame allocator.");
-
-    kmemset(frames, 0, sizeof(frames));
-
-    mark_used(0, MEM_UPPER_BASE - 1);
-
-    mark_used(kinfo->kernel_phys_base, kinfo->kernel_phys_limit);
-
-    for (unsigned int i = 0; i < kinfo->modules_count; ++i) {
-        const struct KernelMQ_Info_Module *const module = &kinfo->modules[i];
-
-        mark_used(module->base, module->limit);
-    }
-
-    for (unsigned int i = 0; i < kinfo->areas_count; ++i) {
-        const struct KernelMQ_Info_Area *const area = &kinfo->areas[i];
-
-        if (!area->is_available) {
-            mark_used(area->base, area->limit);
-        }
-    }
-}
-
-void pfa_print_info()
-{
-    unsigned char started = 0;
-    unsigned int start = 0;
-
-    for (unsigned int index = 0; index <= FRAMES_COUNT; ++index) {
-        if (frames[index]) {
-            if (!started) {
-                started = 1;
-                start = index;
-            }
-        }
-        else {
-            if (started) {
-                const unsigned int end = index - 1;
-
-                if (start < end) {
-                    logger_debug_from(
-                        "pfa",
-                        "Pages allocated: %u-%u",
-                        start * PAGE_SIZE,
-                        end * PAGE_SIZE
-                    );
-                }
-                else {
-                    logger_debug_from(
-                        "pfa",
-                        "Page allocated: %u",
-                        start * PAGE_SIZE
-                    );
-                }
-            }
-
-            started = 0;
-        }
-    }
-}
-
-void mark_used(const unsigned long base, const unsigned long limit)
-{
-    const unsigned int start = base  / PAGE_SIZE;
-    const unsigned int end   = limit / PAGE_SIZE;
-
-    for (unsigned int i = start; i <= end; ++i) {
-        frames[i] = 0xFF;
-    }
-}
diff --git a/kernelmq/pfa.h b/kernelmq/pfa.h
deleted file mode 100644
index 629c044..0000000
--- a/kernelmq/pfa.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef KERNELMQ_INCLUDED_PFA
-#define KERNELMQ_INCLUDED_PFA 1
-
-#include "info.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void pfa_initialize(const struct KernelMQ_Info *kinfo);
-
-void pfa_print_info();
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif