44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
// Physical memory layout
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// qemu -machine virt is set up like this,
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// based on qemu's hw/riscv/virt.c:
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//
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// 00001000 -- boot ROM, provided by qemu
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// 02000000 -- CLINT
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// 0C000000 -- PLIC
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// 10000000 -- uart0 registers
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// 80000000 -- boot ROM jumps here in machine mode
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// -kernel loads the kernel here
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// 88000000 -- -initrd fs.img ramdisk image.
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// unused RAM after 80000000.
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// the kernel uses physical memory thus:
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// 80000000 -- entry.S, then kernel text and data
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// end -- start of kernel page allocation area
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// PHYSTOP -- end RAM used by the kernel
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// qemu puts UART registers here in physical memory.
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#define UART0 0x10000000L
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#define UART0_IRQ 10
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// local interrupt controller, which contains the timer.
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#define CLINT 0x2000000L
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#define CLINT_MSIP0 (CLINT + 0x0)
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#define CLINT_MTIMECMP0 (CLINT + 0x4000)
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#define CLINT_MTIME (CLINT + 0xBFF8)
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// qemu puts programmable interrupt controller here.
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#define PLIC 0x0c000000L
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#define RAMDISK 0x88000000L
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// the kernel expects there to be RAM
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// for use by the kernel and user pages
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// from physical address 0x80000000 to PHYSTOP.
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#define KERNBASE 0x80000000L
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#define PHYSTOP (KERNBASE + 128*1024*1024)
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// map the trampoline page to the highest address,
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// in both user and kernel space.
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#define TRAMPOLINE (MAXVA - PGSIZE)
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