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lib: utils/irqchip: Add FDT wrappers for PLIC save/restore functions

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These functions save/restore the state of the PLIC associated with the
current hart. The context save/restore functions only manipulate a
single context, since most likely the M-mode context is unused and does
not need to be saved.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2022-06-12 20:03:53 -05:00
committed by Anup Patel
parent 2b79b694a8
commit 69be3dff9d
2 changed files with 52 additions and 0 deletions
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20
include/sbi_utils/irqchip/fdt_irqchip_plic.h Normal file
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@@ -0,0 +1,20 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Samuel Holland <samuel@sholland.org>
*/
#ifndef __IRQCHIP_FDT_IRQCHIP_PLIC_H__
#define __IRQCHIP_FDT_IRQCHIP_PLIC_H__
#include <sbi/sbi_types.h>
void fdt_plic_priority_save(u8 *priority);
void fdt_plic_priority_restore(const u8 *priority);
void fdt_plic_context_save(bool smode, u32 *enable, u32 *threshold);
void fdt_plic_context_restore(bool smode, const u32 *enable, u32 threshold);
#endif

32
lib/utils/irqchip/fdt_irqchip_plic.c
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@@ -24,6 +24,38 @@ static struct plic_data plic[PLIC_MAX_NR];
static struct plic_data *plic_hartid2data[SBI_HARTMASK_MAX_BITS];
static int plic_hartid2context[SBI_HARTMASK_MAX_BITS][2];
void fdt_plic_priority_save(u8 *priority)
{
struct plic_data *plic = plic_hartid2data[current_hartid()];
plic_priority_save(plic, priority);
}
void fdt_plic_priority_restore(const u8 *priority)
{
struct plic_data *plic = plic_hartid2data[current_hartid()];
plic_priority_restore(plic, priority);
}
void fdt_plic_context_save(bool smode, u32 *enable, u32 *threshold)
{
u32 hartid = current_hartid();
plic_context_save(plic_hartid2data[hartid],
plic_hartid2context[hartid][smode],
enable, threshold);
}
void fdt_plic_context_restore(bool smode, const u32 *enable, u32 threshold)
{
u32 hartid = current_hartid();
plic_context_restore(plic_hartid2data[hartid],
plic_hartid2context[hartid][smode],
enable, threshold);
}
static int irqchip_plic_warm_init(void)
{
u32 hartid = current_hartid();