os-workshop

same materials and sample source for RV32 OS projects
git clone http://frotz.net/git/os-workshop.git
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info.c (557B)

      1 // Copyright 2022, Brian Swetland <swetland@frotz.net>
      2 // Licensed under the Apache License, Version 2.0
      3 
      4 #include <hw/debug.h>
      5 #include <hw/riscv.h>
      6 #include <hw/intrinsics.h>
      7 
      8 void start(uint32_t hartid, uint32_t dtb) {
      9 	xprintf("MSTATUS    %08x\n", csr_read(CSR_MSTATUS));
     10 	xprintf("MISA       %08x\n", csr_read(CSR_MISA));
     11 	xprintf("MCYCLE     %08x\n", csr_read(CSR_MCYCLE));
     12 	xprintf("DeviceTree %08x\n", dtb);
     13 
     14 	uint32_t n = csr_read(CSR_MISA);
     15 	xprintf("ISA: RV32");
     16 	for (int i = 0; i < 26; i++) {
     17 		if (n & (1<<i)) xputc('A'+i);
     18 	}
     19 	xputc('\n');
     20 }