mirror of https://github.com/xemu-project/xemu.git
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* QEMU PowerPC sPAPR IRQ interface
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*
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* Copyright (c) 2018, IBM Corporation.
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*
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* This code is licensed under the GPL version 2 or later. See the
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* COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "hw/ppc/spapr.h"
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#include "hw/ppc/xics.h"
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void spapr_irq_msi_init(sPAPRMachineState *spapr, uint32_t nr_msis)
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{
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spapr->irq_map_nr = nr_msis;
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spapr->irq_map = bitmap_new(spapr->irq_map_nr);
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}
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int spapr_irq_msi_alloc(sPAPRMachineState *spapr, uint32_t num, bool align,
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Error **errp)
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{
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int irq;
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/*
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* The 'align_mask' parameter of bitmap_find_next_zero_area()
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* should be one less than a power of 2; 0 means no
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* alignment. Adapt the 'align' value of the former allocator
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* to fit the requirements of bitmap_find_next_zero_area()
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*/
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align -= 1;
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irq = bitmap_find_next_zero_area(spapr->irq_map, spapr->irq_map_nr, 0, num,
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align);
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if (irq == spapr->irq_map_nr) {
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error_setg(errp, "can't find a free %d-IRQ block", num);
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return -1;
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}
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bitmap_set(spapr->irq_map, irq, num);
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return irq + SPAPR_IRQ_MSI;
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}
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void spapr_irq_msi_free(sPAPRMachineState *spapr, int irq, uint32_t num)
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{
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bitmap_clear(spapr->irq_map, irq - SPAPR_IRQ_MSI, num);
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}
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void spapr_irq_msi_reset(sPAPRMachineState *spapr)
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{
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bitmap_clear(spapr->irq_map, 0, spapr->irq_map_nr);
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}
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