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eb61470e22
Align heap start and caculate number of reserved pages according to the length of ram available. See https://gitee.com/unicornx/riscv-operating-system-mooc/issues/I9LNCF. Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
33 lines
763 B
C
33 lines
763 B
C
#ifndef __PLATFORM_H__
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#define __PLATFORM_H__
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/*
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* QEMU RISC-V Virt machine with 16550a UART and VirtIO MMIO
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*/
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/*
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* maximum number of CPUs
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* see https://github.com/qemu/qemu/blob/master/include/hw/riscv/virt.h
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* #define VIRT_CPUS_MAX 8
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*/
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#define MAXNUM_CPU 8
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/* used in os.ld */
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#define LENGTH_RAM 128*1024*1024
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/*
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* MemoryMap
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* see https://github.com/qemu/qemu/blob/master/hw/riscv/virt.c, virt_memmap[]
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* 0x00001000 -- boot ROM, provided by qemu
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* 0x02000000 -- CLINT
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* 0x0C000000 -- PLIC
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* 0x10000000 -- UART0
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* 0x10001000 -- virtio disk
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* 0x80000000 -- boot ROM jumps here in machine mode, where we load our kernel
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*/
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/* This machine puts UART registers here in physical memory. */
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#define UART0 0x10000000L
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#endif /* __PLATFORM_H__ */
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