UltraSPARC IIi BKI

This section details the state that the CPU should be in for the UltraSPARC IIi BKI.

Register I/O must contain a pointer to the BootConf structure.

Interrupts must be disabled.

Instruction and data caches must be disabled.

At address 0, a minimal trap table must be installed with spill/fill trap handlers.

MMU translation must be enabled.

An initial one-to-one mapping must be built by the boot program. This one-to-one mapping must start at 0 and be large enough to cover all virtual addresses for the memory bank's binary segments. Note that instruction and data Table Look-up Buffers (TLBs) mapped in this way will intially be locked and all TLB entries not included in the initial mapping will be invalid.

The kernelSpace field in the BootConf object must point to a description of the initial space established by the microkernel's memory management unit, as described in "The Initial Address Space". The family-dependent part of the tag field of the PhChunk entry is defined as a combination of the following bits:

Table 3-2 PhChunk KSP region type

PhChunk Bit	Meaning
KSP_US_TYPE_RAM	one-to-one RAM mapping

Table 3-3 PHChunk Data attributes

PhChunk Bit	Meaning
KSP_US_ATTR_DG	global
KSP_US_ATTR_DW	writable
KSP_US_ATTR_DP	privileged
KSP_US_ATTR_DE	side effect
KSP_US_ATTR_DCV	cached virtually
KSP_US_ATTR_DCP	cached physically (L2-cache)
KSP_US_ATTR_DIE	inverted endiannes
KSP_US_ATTR_DNFO	non faulted only
KSP_US_ATTR_DV	valid

Table 3-4 PHChunk Instruction attributes

PHChunk Bit	Meaning
KSP_US_ATTR_IG	global
KSP_US_ATTR_IV	valid
KSP_US_ATTR_IP	privileged
KSP_US_ATTR_ICP	cached physically (L2-cache)

The initial kernel space must at least contain the one-to-one mapping of the available RAM.

The f_bootConf field of the BootConf structure must point to a processor specific decriptor:

typedef struct usparc_BootConf {

    VmAddr      tlb_lock_start; /* start, size and attributes of the memory */
    VmSize      tlb_lock_size;  /* region locked in I and D TLB by          */
    int         tlb_lock_attr;  /* the bootstrap program                    */

    VmAddr      trap_table_start; /* address of the trap table */

  } usparc_BootConf;

The first three fields decribe the initial one-to-one mapping. The last one gives the address of the trap table. The SPARC_PROP_I_CACHE and SPARC_PROP_D_CACHE properties must be present in the initial device tree. Values for these properties are of the type SparcPropCache:

typedef struct {
    uint32_f  csize;            /* cache size */
    uint32_f  bsize;            /* cache bank size */
    uint32_f  lsize;            /* cache line size */
    uint32_f  nbanks;           /* number of bunks (csize = bsize * nbanks) */
    uint32_f  type;             /* cache type */
  } SparcPropCache;