io-apic.h

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#ifndef XTF_X86_IO_APIC_H
#define XTF_X86_IO_APIC_H
 
#include <xtf/numbers.h>
#include <xtf/types.h>
 
/* MMIO window registers. */
#define IOAPIC_REGSEL             0x00
#define IOAPIC_IOWIN              0x10
 
/* IO-APIC registers. */
#define IOAPIC_ID                 0x0
 
#define IOAPIC_VERSION            0x1
#define   IOAPIC_MAXREDIR_MASK    0xff0000
 
#define IOAPIC_REDIR_ENTRY(e)     (0x10 + (e) * 2)
#define   IOAPIC_REDIR_MASK_SHIFT 16
 
#define IOAPIC_DEFAULT_BASE       0xfec00000
 
int ioapic_init(void);
 
static inline uint32_t ioapic_read32(unsigned int reg)
{
    *(volatile uint32_t *)_p(IOAPIC_DEFAULT_BASE + IOAPIC_REGSEL) = reg;
 
    return *(volatile uint32_t *)_p(IOAPIC_DEFAULT_BASE + IOAPIC_IOWIN);
}
 
static inline uint64_t ioapic_read64(unsigned int reg)
{
    return ioapic_read32(reg) | (uint64_t)ioapic_read32(reg + 1) << 32;
}
 
static inline void ioapic_write32(unsigned int reg, uint32_t val)
{
    *(volatile uint32_t *)_p(IOAPIC_DEFAULT_BASE + IOAPIC_REGSEL) = reg;
    *(volatile uint32_t *)_p(IOAPIC_DEFAULT_BASE + IOAPIC_IOWIN) = val;
}
 
static inline void ioapic_write64(unsigned int reg, uint64_t val)
{
    ioapic_write32(reg, val);
    ioapic_write32(reg + 1, val >> 32);
}
 
int ioapic_set_mask(unsigned int entry, bool mask);
 
#endif /* !XTF_X86_IO_APIC_H */
 
/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */