io-apic.c

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#include <xtf/lib.h>
 
#include <xen/errno.h>
 
#include <arch/io-apic.h>
 
static unsigned int nr_entries;
 
int ioapic_init(void)
{
    uint32_t id = ioapic_read32(IOAPIC_ID);
 
    /* Bare MMIO? */
    if ( id == ~0u )
        return -ENODEV;
 
    nr_entries = MASK_EXTR(ioapic_read32(IOAPIC_VERSION),
                           IOAPIC_MAXREDIR_MASK) + 1;
 
    return 0;
}
 
int ioapic_set_mask(unsigned int entry, bool mask)
{
    uint32_t redir;
 
    if ( entry >= nr_entries )
        return -EINVAL;
 
    redir = ioapic_read32(IOAPIC_REDIR_ENTRY(entry));
    redir &= ~(1u << IOAPIC_REDIR_MASK_SHIFT);
    if ( mask )
        redir |= 1u << IOAPIC_REDIR_MASK_SHIFT;
    ioapic_write32(IOAPIC_REDIR_ENTRY(entry), redir);
 
    return 0;
}
 
/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */