From b8284137d4e0eec11c78bc14047243fce6a51373 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 6 Sep 2020 15:47:06 -0400
Subject: minor changes, redoing makefile, meminfo program

---
 src/kernel/elf-link.ld |  2 +-
 src/kernel/idt.c       | 40 +++++++++++++++++++++++++++++++++++-----
 src/kernel/isrs.asm    |  2 +-
 src/kernel/log.c       |  2 ++
 src/kernel/main.c      | 23 +++++++++--------------
 src/kernel/task.c      |  3 +--
 6 files changed, 49 insertions(+), 23 deletions(-)

(limited to 'src/kernel')

diff --git a/src/kernel/elf-link.ld b/src/kernel/elf-link.ld
index 10abac0..84d3f92 100644
--- a/src/kernel/elf-link.ld
+++ b/src/kernel/elf-link.ld
@@ -4,7 +4,7 @@ OUTPUT_ARCH(i386)
 SECTIONS {
   . = 0x00030000;
   .text : {
-    */main.o(.text)
+    */main.ko(.text)
     *(.text)
   }
   .rodata : {
diff --git a/src/kernel/idt.c b/src/kernel/idt.c
index 31d597f..3d23797 100644
--- a/src/kernel/idt.c
+++ b/src/kernel/idt.c
@@ -6,6 +6,7 @@
 #include "panic.h"
 #include "task.h"
 #include "paging.h"
+#include "pmap.h"
 
 enum {
   IDT_PRESENT = 0x80,
@@ -73,6 +74,32 @@ static void *sc_allocate_ram(uint32_t pages) {
   return pd_user_allocate_anywhere_writable(active_task->page_directory, pages);
 }
 
+enum mi_arg {
+  MI_KERNEL_MAX,
+  MI_KERNEL_LEFT,
+  MI_USER_MAX,
+  MI_USER_LEFT,
+  MI_TASK_LEFT
+};
+
+__attribute__ ((pure))
+static uint32_t sc_memory_info(enum mi_arg arg) {
+  switch (arg) {
+  case MI_KERNEL_MAX:
+    return max_kernel_pages;
+  case MI_KERNEL_LEFT:
+    return kernel_pages_left;
+  case MI_USER_MAX:
+    return max_user_pages;
+  case MI_USER_LEFT:
+    return user_pages_left;
+  case MI_TASK_LEFT:
+    panic("TODO: this process memory left");
+  default:
+    return -1;
+  }
+}
+
 void const *syscall_table[] = {
   &sc_open_file,
   &sc_close_file,
@@ -81,14 +108,17 @@ void const *syscall_table[] = {
   &sc_start_task,
   &sc_log_string,
   &sc_get_key,
-  &sc_allocate_ram
+  &sc_allocate_ram,
+  &sc_memory_info
 };
 
-extern void syscall_isr;
-extern void quit_isr;
-extern void yield_isr;
+typedef void isr_t;
+
+extern isr_t syscall_isr;
+extern isr_t quit_isr;
+extern isr_t yield_isr;
 
-static void register_int(uint8_t n, void *isr, uint8_t dpl) {
+static void register_int(uint8_t n, isr_t *isr, uint8_t dpl) {
   idt[n].addr_low = (uint32_t)isr & 0xffff;
   idt[n].addr_high = (uint32_t)isr >> 16;
   idt[n].cs = 0x10;
diff --git a/src/kernel/isrs.asm b/src/kernel/isrs.asm
index 1fd6fcb..82c17fe 100644
--- a/src/kernel/isrs.asm
+++ b/src/kernel/isrs.asm
@@ -11,7 +11,7 @@ extern active_task
 extern delete_task
 extern advance_active_task
 
-n_syscalls equ 8
+n_syscalls equ 0x9
 
 section .text
 syscall_isr:
diff --git a/src/kernel/log.c b/src/kernel/log.c
index 39fc1ba..b5a96cb 100644
--- a/src/kernel/log.c
+++ b/src/kernel/log.c
@@ -12,6 +12,8 @@ static const uint8_t log_mode_colors[] = {
 
 void set_log_mode(enum log_mode mode) {
   vga_set_color(log_mode_colors[mode]);
+  vga_printch('\n');
+  vga_printch('\n');
 }
 
 void logch(char ch) {
diff --git a/src/kernel/main.c b/src/kernel/main.c
index 2f63d71..d99b595 100644
--- a/src/kernel/main.c
+++ b/src/kernel/main.c
@@ -124,30 +124,25 @@ void main() {
     logch('\n');
   }
 
-  if (!try_elf_run(drives, "BIN/INIT.ELF"))
-    panic("Failed to load init program.");
-
   if (BOOT_INFO->support_flags & BIS_PAE)
-    logsz("Processor supports PAE (but Portland OS does not yet).\n\n");
+    logsz("Processor supports PAE (but Portland OS does not yet).\n");
   else
-    logsz("Processor does not support PAE.\n\n");
+    logsz("Processor does not support PAE.\n");
 
-  u32_dec(kernel_pages_left * 4, nbuf);
-  logsz(nbuf);
-  logsz("k / ");
+  logsz("Kernel dynamic area size: ");
   u32_dec(max_kernel_pages * 4, nbuf);
   logsz(nbuf);
-  logsz("k kernel heap free.\n");
-  u32_dec(user_pages_left * 4, nbuf);
-  logsz(nbuf);
-  logsz("k / ");
+  logsz("k\nUserspace area size: ");
   u32_dec(max_user_pages * 4, nbuf);
   logsz(nbuf);
-  logsz("k user memory free.\n");
+  logsz("k\n\n");
+
+  if (!try_elf_run(drives, "BIN/INIT.ELF"))
+    panic("Failed to load init program.");
 
   init_idt();
 
+  logsz("Switching to init task.\n");
   set_log_mode(LOG_USER);
-  logch('\n');
   _start_user_mode();
 }
\ No newline at end of file
diff --git a/src/kernel/task.c b/src/kernel/task.c
index 80818a7..2a1f4c4 100644
--- a/src/kernel/task.c
+++ b/src/kernel/task.c
@@ -79,9 +79,8 @@ void advance_active_task() {
     if (++active_task == tasks + MAX_TASKS)
       active_task = tasks;
     if (active_task == prev_task) {
-      logch('\n');
       set_log_mode(LOG_SYSTEM);
-      logsz("\nNo active tasks, halting.");
+      logsz("No active tasks, halting.");
       while (1)
         asm ("hlt");
     }
-- 
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