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lib: Move software interrupt enablement from firmware to lib

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The secondary hart waits for an IPI signal from the boot hart to
executing boot code (hot boot). As a result, software generated
interrupts have to be enabled for secondary harts before waiting for
the boot hart boot completion IPI signal.

Enabling software generated interrupts (IPI) can be done independently
of the firmware code and moved to libsbi code so that the different
firmware do not have to implement this.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra 2019-01-18 13:35:47 -08:00 • committed by Anup Patel
parent 1ee745fe57
commit 784a4657c0
2 changed files with 4 additions and 4 deletions
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4
firmware/fw_base.S
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@ -125,10 +125,6 @@ _start_warm:
csrw mie, zero
csrw mip, zero
/* Set MSIE bit to receive IPI */
li a2, MIP_MSIP
csrw mie, a2
/* Preload per-HART details
* s6 -> HART ID
* s7 -> HART Count

4
lib/sbi_hart.c
View file

@ -304,6 +304,10 @@ void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
if ((sbi_platform_hart_count(plat) <= hartid) ||
(COLDBOOT_WAIT_BITMAP_SIZE <= hartid))
sbi_hart_hang();
/* Set MSIE bit to receive IPI */
csr_set(mie, MIP_MSIP);
do {
spin_lock(&coldboot_wait_bitmap_lock);
coldboot_wait_bitmap |= (1UL << hartid);