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arch/riscv: Implement the SBI again

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Not all SBI calls are implemented, but it's enough to see a couple dozen
lines of Linux boot output.

It should also be noted that the SBI is still in flux:
https://groups.google.com/a/groups.riscv.org/forum/#!topic/sw-dev/6oNhlW0OFKM

Change-Id: I80e4fe508336d6428ca7136bc388fbc3cda4f1e4
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/16119
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Jonathan Neuschäfer
2016-08-22 19:37:16 +02:00
committed by Ronald G. Minnich
parent 3965a522c2
commit 857e33e27f
6 changed files with 183 additions and 39 deletions
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3
src/arch/riscv/virtual_memory.c
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@@ -16,6 +16,7 @@
#include <arch/barrier.h>
#include <arch/encoding.h>
#include <arch/sbi.h>
#include <atomic.h>
#include <console/console.h>
#include <stdint.h>
@@ -151,7 +152,7 @@ void init_vm(uintptr_t virtMemStart, uintptr_t physMemStart, uintptr_t pageTable
// map SBI at top of vaddr space
uintptr_t num_sbi_pages = 1; // only need to map a single page for sbi interface
uintptr_t sbiStartAddress = 0x2000; // the start of the sbi mapping
uintptr_t sbiStartAddress = (uintptr_t) &sbi_page;
uintptr_t sbiAddr = sbiStartAddress;
for (uintptr_t i = 0; i < num_sbi_pages; i++) {
uintptr_t idx = (1 << RISCV_PGLEVEL_BITS) - num_sbi_pages + i;