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arch/riscv: Only initialize virtual memory if it's available 

And do the detection just before the initialization.

Change-Id: I9a52430262f799baa298dc4f4ea459880abe250e
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/15831
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Jonathan Neuschäfer 2016-07-25 00:42:24 +02:00 committed by Ronald G. Minnich
parent 0cc02efb23
commit 62bd9f93dd
1 changed files with 16 additions and 10 deletions
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26
src/arch/riscv/virtual_memory.c
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@ -95,6 +95,22 @@ void init_vm(uintptr_t virtMemStart, uintptr_t physMemStart, uintptr_t pageTable
} }
void initVirtualMemory(void) { void initVirtualMemory(void) {
uintptr_t ms;
ms = read_csr(mstatus);
ms = INSERT_FIELD(ms, MSTATUS_VM, VM_CHOICE);
write_csr(mstatus, ms);
ms = read_csr(mstatus);
if (EXTRACT_FIELD(ms, MSTATUS_VM) != VM_CHOICE) {
printk(BIOS_DEBUG, "We don't have virtual memory...\n");
return;
} else {
printk(BIOS_DEBUG, "-----------------------------\n");
printk(BIOS_DEBUG, "Virtual memory status enabled\n");
printk(BIOS_DEBUG, "-----------------------------\n");
}
printk(BIOS_DEBUG, "Initializing virtual memory...\n"); printk(BIOS_DEBUG, "Initializing virtual memory...\n");
uintptr_t physicalStart = 0x1000000; // TODO: Figure out how to grab this from cbfs uintptr_t physicalStart = 0x1000000; // TODO: Figure out how to grab this from cbfs
uintptr_t virtualStart = 0xffffffff81000000; uintptr_t virtualStart = 0xffffffff81000000;
@ -114,19 +130,9 @@ void mstatus_init(void)
ms = INSERT_FIELD(ms, MSTATUS_PRV1, PRV_S); ms = INSERT_FIELD(ms, MSTATUS_PRV1, PRV_S);
ms = INSERT_FIELD(ms, MSTATUS_PRV2, PRV_U); ms = INSERT_FIELD(ms, MSTATUS_PRV2, PRV_U);
ms = INSERT_FIELD(ms, MSTATUS_IE2, 1); ms = INSERT_FIELD(ms, MSTATUS_IE2, 1);
ms = INSERT_FIELD(ms, MSTATUS_VM, VM_CHOICE);
ms = INSERT_FIELD(ms, MSTATUS_FS, 3); ms = INSERT_FIELD(ms, MSTATUS_FS, 3);
ms = INSERT_FIELD(ms, MSTATUS_XS, 3); ms = INSERT_FIELD(ms, MSTATUS_XS, 3);
write_csr(mstatus, ms); write_csr(mstatus, ms);
ms = read_csr(mstatus);
if (EXTRACT_FIELD(ms, MSTATUS_VM) != VM_CHOICE) {
printk(BIOS_DEBUG, "we don't have virtual memory...\n");
} else {
printk(BIOS_DEBUG, "-----------------------------\n");
printk(BIOS_DEBUG, "virtual memory status enabled\n");
printk(BIOS_DEBUG, "-----------------------------\n");
}
clear_csr(mip, MIP_MSIP); clear_csr(mip, MIP_MSIP);
set_csr(mie, MIP_MSIP); set_csr(mie, MIP_MSIP);