2 * Misc. kernel definitions
3 * Copyright (c) 2001,2004 David H. Hovemeyer <daveho@cs.umd.edu>
6 * This is free software. You are permitted to use,
7 * redistribute, and modify it as specified in the file "COPYING".
17 * Kernel code and data segment selectors.
18 * Keep these up to date with defs.asm.
20 #define KERNEL_CS (1<<3)
21 #define KERNEL_DS (2<<3)
25 * Address where kernel is loaded INITIALLY
26 * we move it up in memory soon
28 #define KERNEL_START_ADDR 0x10000
31 * Kernel and user privilege levels
33 #define KERNEL_PRIVILEGE 0
34 #define USER_PRIVILEGE 3
38 * Software interrupt for syscalls
40 #define SYSCALL_INT 0x90
43 * The windows versions of gcc use slightly different
44 * names for the bss begin and end symbols than the Linux version.
46 #if defined(GNU_WIN32)
47 # define BSS_START _bss_start__
48 # define BSS_END _bss_end__
50 # define BSS_START __bss_start
55 * x86 has 4096 byte pages
58 #define PAGE_SIZE (1<<PAGE_POWER)
59 #define PAGE_MASK (~(0xffffffff << PAGE_POWER))
63 /* Ultimate Memory Layout
75 PageList (varies - must be an integral number of pages)
76 KernelHeap (varies - KERNEL_HEAP_SIZE; must be integral number of pages)
77 KernelStack (one page)
78 KernelThreadObject (one page)
80 VM (including ISA hole)
81 (KernelImage, GDT, and IDT start down here and are moved up)
82 (VMBoot Package is copied down to the first MB to start the VM boot)
83 (VMXAssist is used to provide real mode emulation for initial VM boot steps)
87 // This is for a 1 GB Machine
88 // The last address (+1) at which physical memory ends
89 #define TOP_OF_MEM (0x40000000)
90 // How much space to reserve for the VM
91 #define VM_SIZE (0x20000000)
92 // Where the VM starts in physical memory
93 #define START_OF_VM (0x0)
94 // Where we load the vm's kernel image (1MB)
95 #define VM_KERNEL_TARGET (0x100000)
99 #define GDT_SIZE PAGE_SIZE
100 #define TSS_SIZE PAGE_SIZE
101 #define IDT_SIZE PAGE_SIZE
102 #define KERNEL_HEAP_SIZE (256*PAGE_SIZE)
103 #define KERNEL_STACK_SIZE PAGE_SIZE
104 #define KERNEL_THREAD_OBJECT_SIZE PAGE_SIZE
110 * * Keep these up to date with defs.asm.
112 #define GDT_LOCATION (TOP_OF_MEM-GDT_SIZE)
113 #define TSS_LOCATION (GDT_LOCATION-TSS_SIZE)
114 #define IDT_LOCATION (TSS_LOCATION-IDT_SIZE)
117 #define FINAL_KERNEL_START (IDT_LOCATION-MAX_VMM)
118 #define FINAL_KERNEL_END (FINAL_KERNEL_START+KERNEL_CORE_LENGTH-1)
119 #define FINAL_VM_KERNEL_START (FINAL_KERNEL_START+KERNEL_CORE_LENGTH)
120 #define FINAL_VM_KERNEL_END (FINAL_VM_KERNEL_START+VM_KERNEL_LENGTH-1)
121 #define FINAL_VMBOOTSTART (FINAL_VM_KERNEL_START)
122 #define FINAL_VMBOOTEND (VM_BOOT_PACKAGE_END)
124 #if (FINAL_VMBOOTEND>IDT_LOCATION)
125 #error VMM_MAX is too small!
129 #define KERNEL_THREAD_OBJECT (START_OF_VM+VM_SIZE)
130 #define KERNEL_STACK (KERNEL_THREAD_OBJECT+KERNEL_THREAD_OBJECT_SIZE)
131 #define KERNEL_HEAP (KERNEL_STACK+KERNEL_STACK_SIZE)
132 #define KERNEL_PAGELIST (KERNEL_HEAP+KERNEL_HEAP_SIZE)
138 #define ISA_HOLE_START 0x0A0000
139 #define ISA_HOLE_END 0x100000
142 #endif /* GEEKOS_DEFS_H */