207d9fe985
Each POWER9 processor chip has a XIVE presenter that can generate four different exceptions to its threads: - hypervisor exception, - O/S exception - Event-Based Branch (EBB) - msgsnd (doorbell). Each exception has a state independent from the others called a Thread Interrupt Management context. This context is a set of registers which lets the thread handle priority management and interrupt acknowledgment among other things. The most important ones being : - Interrupt Priority Register (PIPR) - Interrupt Pending Buffer (IPB) - Current Processor Priority (CPPR) - Notification Source Register (NSR) These registers are accessible through a specific MMIO region, called the Thread Interrupt Management Area (TIMA), four aligned pages, each exposing a different view of the registers. First page (page address ending in 0b00) gives access to the entire context and is reserved for the ring 0 view for the physical thread context. The second (page address ending in 0b01) is for the hypervisor, ring 1 view. The third (page address ending in 0b10) is for the operating system, ring 2 view. The fourth (page address ending in 0b11) is for user level, ring 3 view. The thread interrupt context is modeled with a XiveTCTX object containing the values of the different exception registers. The TIMA region is mapped at the same address for each CPU. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> |
||
|---|---|---|
| .. | ||
| fdt.h | ||
| mac_dbdma.h | ||
| openpic_kvm.h | ||
| openpic.h | ||
| pnv_core.h | ||
| pnv_lpc.h | ||
| pnv_occ.h | ||
| pnv_psi.h | ||
| pnv_xscom.h | ||
| pnv.h | ||
| ppc4xx.h | ||
| ppc_e500.h | ||
| ppc.h | ||
| spapr_cpu_core.h | ||
| spapr_drc.h | ||
| spapr_irq.h | ||
| spapr_ovec.h | ||
| spapr_rtas.h | ||
| spapr_vio.h | ||
| spapr.h | ||
| xics.h | ||
| xive_regs.h | ||
| xive.h | ||