kernel/memlayout.h
59 lines
1// Physical memory layout23// qemu -machine virt is set up like this,4// based on qemu's hw/riscv/virt.c:5//6// 00001000 -- boot ROM, provided by qemu7// 02000000 -- CLINT8// 0C000000 -- PLIC9// 10000000 -- uart0 10// 10001000 -- virtio disk 11// 80000000 -- qemu's boot ROM loads the kernel here,12// then jumps here.13// unused RAM after 80000000.1415// the kernel uses physical memory thus:16// 80000000 -- entry.S, then kernel text and data17// end -- start of kernel page allocation area18// PHYSTOP -- end RAM used by the kernel1920// qemu puts UART registers here in physical memory.21#define UART0 0x10000000L22#define UART0_IRQ 102324// virtio mmio interface25#define VIRTIO0 0x1000100026#define VIRTIO0_IRQ 12728// qemu puts platform-level interrupt controller (PLIC) here.29#define PLIC 0x0c000000L30#define PLIC_PRIORITY (PLIC + 0x0)31#define PLIC_PENDING (PLIC + 0x1000)32#define PLIC_SENABLE(hart) (PLIC + 0x2080 + (hart)*0x100)33#define PLIC_SPRIORITY(hart) (PLIC + 0x201000 + (hart)*0x2000)34#define PLIC_SCLAIM(hart) (PLIC + 0x201004 + (hart)*0x2000)3536// the kernel expects there to be RAM37// for use by the kernel and user pages38// from physical address 0x80000000 to PHYSTOP.39#define KERNBASE 0x80000000L40#define PHYSTOP (KERNBASE + 128*1024*1024)4142// map the trampoline page to the highest address,43// in both user and kernel space.44#define TRAMPOLINE (MAXVA - PGSIZE)4546// map kernel stacks beneath the trampoline,47// each surrounded by invalid guard pages.48#define KSTACK(p) (TRAMPOLINE - ((p)+1)* 2*PGSIZE)4950// User memory layout.51// Address zero first:52// text53// original data and bss54// fixed-size stack55// expandable heap56// ...57// TRAPFRAME (p->trapframe, used by the trampoline)58// TRAMPOLINE (the same page as in the kernel)59#define TRAPFRAME (TRAMPOLINE - PGSIZE)60