Hi, On Tue, Sep 12, 2017 at 02:57:05PM -0700, Palmer Dabbelt wrote: > This patch adds a driver for the Platform Level Interrupt Controller > (PLIC) specified as part of the RISC-V supervisor level ISA manual. > The PLIC connocts global interrupt sources to the local interrupt s/connocts/connects/? > controller on each hart. A PLIC is present on all RISC-V systems. > > Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxx> > --- [...] > +/* > + * The PLIC consists of memory-mapped control registers, with a memory map as > + * follows: This memory map is mostly still as confusing as before (see my email in the v7 thread). > + * > + * base + 0x000000: Reserved (interrupt source 0 does not exist) > + * base + 0x000004: Interrupt source 1 priority > + * base + 0x000008: Interrupt source 2 priority > + * ... > + * base + 0x000FFC: Interrupt source 1023 priority > + * base + 0x001000: Pending 0 > + * base + 0x001FFF: Pending > + * base + 0x002000: Enable bits for sources 0-31 on context 0 > + * base + 0x002004: Enable bits for sources 32-63 on context 0 > + * ... > + * base + 0x0020FC: Enable bits for sources 992-1023 on context 0 > + * base + 0x002080: Enable bits for sources 0-31 on context 1 > + * ... > + * base + 0x002100: Enable bits for sources 0-31 on context 2 > + * ... > + * base + 0x1F1F80: Enable bits for sources 992-1023 on context 15871 > + * base + 0x1F1F84: Reserved > + * ... (higher context IDs would fit here, but wouldn't fit > + * inside the per-context priority vector) > + * base + 0x1FFFFC: Reserved > + * base + 0x200000: Priority threshold for context 0 > + * base + 0x200004: Claim/complete for context 0 > + * base + 0x200008: Reserved > + * ... > + * base + 0x200FFC: Reserved > + * base + 0x201000: Priority threshold for context 1 > + * base + 0x201004: Claim/complete for context 1 > + * ... > + * base + 0xFFE000: Priority threshold for context 15871 > + * base + 0xFFE004: Claim/complete for context 15871 > + * base + 0xFFE008: Reserved > + * ... > + * base + 0xFFFFFC: Reserved > + */ Jonathan Neuschäfer
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