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Turn on the FPU for OS math.

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This commit is contained in:
Stephen Marz 2020-05-23 11:24:25 -04:00
parent a0c0134fb5
commit c8dc4ff350
1 changed files with 2 additions and 2 deletions
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4
risc_v/src/asm/boot.S
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@ -46,7 +46,7 @@ _start:
la sp, _stack_end
# Setting `mstatus` register:
# 0b01 << 11: Machine's previous protection mode is 2 (MPP=2).
li t0, 0b11 << 11
li t0, 0b11 << 11 | (1 << 13)
csrw mstatus, t0
# Do not allow interrupts while running kinit
csrw mie, zero
@ -67,7 +67,7 @@ _start:
# 1 << 5 : Previous interrupt-enable bit is 1 (SPIE=1 [Enabled]).
# We set the "previous" bits because the mret will write the current bits
# with the previous bits.
li t0, (0b00 << 11) | (1 << 7) | (1 << 5)
li t0, (0b00 << 11) | (1 << 7) | (1 << 5) | (1 << 13)
csrw mstatus, t0
# Machine's trap vector base address is set to `m_trap_vector`, for
# "machine" trap vector.