Increase process size limit to 128KB

Author: scopeInfinity

include/fuzzy/memmgr/layout.h

@@ -4,12 +4,11 @@
 // and kernel's pid is 0.
 #define PID_KERNEL 0
 
-#define MEMORY_KERNEL_LOCATION 0x10000
-#define MEMORY_KERNEL_SIZE     0x0FFFF
+#define MEMORY_APPBASE_LOCATION 0x10000
+#define MEMORY_APP_SIZE         0x20000
 
-#define MEMORY_APPBASE_LOCATION 0x20000
-#define MEMORY_APP_SIZE         0x0FFFF
-
-// pid starts from 1
-#define memmgr_app_abs_location(pid) ((pid)!=0?(MEMORY_APPBASE_LOCATION+((pid)-1)*MEMORY_APP_SIZE):MEMORY_KERNEL_LOCATION)
+#define memmgr_app_abs_location(pid) (MEMORY_APPBASE_LOCATION + (pid)*MEMORY_APP_SIZE)
 #define memmgr_app_size(pid) (MEMORY_APP_SIZE)
+
+#define MEMORY_KERNEL_LOCATION memmgr_app_abs_location(PID_KERNEL)
+#define MEMORY_KERNEL_SIZE memmgr_app_size(PID_KERNEL)

src/kernel/process/allocation.c

@@ -121,13 +121,13 @@ int process_create() {
     // Application Code Segment Selector
     populate_gdt_entry(
         &gdt_table[idt_cs_entry],
-        memory_location, memory_location+0xFFFF,
+        memory_location, memory_location+memory_size-1,
         0b0100,  // 32-bit protected mode
         0x9a);
     // Application Data Segment Selector
     populate_gdt_entry(
         &gdt_table[idt_ds_entry],
-        memory_location, memory_location+0xFFFF,
+        memory_location, memory_location+memory_size-1,
         0b0100,  // 32-bit protected mode
         0x92);
     create_infant_process_irq0_stack(process->ss);

src/memmgr/tables/gdt.c

@@ -38,13 +38,13 @@ void populate_gdt_table(
     // Kernel Code Segment Selector
     populate_gdt_entry(
         &gdt_table[1],
-        MEMORY_KERNEL_LOCATION, MEMORY_KERNEL_LOCATION+MEMORY_KERNEL_SIZE,
+        MEMORY_KERNEL_LOCATION, MEMORY_KERNEL_LOCATION+MEMORY_KERNEL_SIZE-1,
         0b0100,  // 32-bit protected mode
         0x9a);
     // Kernel Data Segment Selector
     populate_gdt_entry(
         &gdt_table[2],
-        MEMORY_KERNEL_LOCATION, MEMORY_KERNEL_LOCATION+MEMORY_KERNEL_SIZE,
+        MEMORY_KERNEL_LOCATION, MEMORY_KERNEL_LOCATION+MEMORY_KERNEL_SIZE-1,
         0b0100,  // 32-bit protected mode
         0x92);
     // Absolute Code Segment Selector

tests/bootloader_stage2_test.sh

@@ -12,7 +12,7 @@ set -e
 
 test_screen_content $LINENO "Bootloader: Stage 2"
 test_screen_content $LINENO "Static library loaded at 0x00007E00: `build_8hexbyte real_mode/static_library`"
-test_screen_content $LINENO "Kernel loaded at 0x0000C000: `build_8hexbyte kernel/core`"
+test_screen_content $LINENO "Kernel loaded at 0x[0-9A-Fa-f]\+: `build_8hexbyte kernel/core`"
 test_screen_content $LINENO "Loading GDT Table and entering protected mode"
 
 wait ${QEMU_PID:?}