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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 15:55:35 (GMT) |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-13 20:26:05 (GMT) |
| commit | ba02f0eb826da6dbdc5a2958ac52304ee441234f (patch) | |
| tree | 8b50a046b6dd1a4cbc1379ae43c1c673c39e8d3d /arch/tile/kernel | |
| parent | bc1a298f4e04833db4c430df59b90039f0170515 (diff) | |
| download | linux-ba02f0eb826da6dbdc5a2958ac52304ee441234f.tar.xz | |
tile: improve big-endian support
First, fix a bug in asm/unaligned.h; we need to just use the asm-generic
unaligned.h so we properly choose endian-correct flavors.
Second, keep the hv/hypervisor.h ABI fully "native" in the sense that
we don't have __BIG_ENDIAN__ ifdefs there. Instead, we use macros in
the head_NN.S assembly code to properly extract two 32-bit structure
members from a 64-bit register holding the structure.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel')
| -rw-r--r-- | arch/tile/kernel/head_64.S | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/arch/tile/kernel/head_64.S b/arch/tile/kernel/head_64.S index e23e5f7..ed51320 100644 --- a/arch/tile/kernel/head_64.S +++ b/arch/tile/kernel/head_64.S @@ -25,6 +25,15 @@ #include <arch/chip.h> #include <arch/spr_def.h> +/* Extract two 32-bit bit values that were read into one register. */ +#ifdef __BIG_ENDIAN__ +#define GET_FIRST_INT(rd, rs) shrsi rd, rs, 32 +#define GET_SECOND_INT(rd, rs) addxi rd, rs, 0 +#else +#define GET_FIRST_INT(rd, rs) addxi rd, rs, 0 +#define GET_SECOND_INT(rd, rs) shrsi rd, rs, 32 +#endif + /* * This module contains the entry code for kernel images. It performs the * minimal setup needed to call the generic C routines. @@ -61,7 +70,7 @@ ENTRY(_start) * other CPUs should see a properly-constructed page table. */ { - v4int_l r2, zero, r0 /* ASID for hv_install_context */ + GET_FIRST_INT(r2, r0) /* ASID for hv_install_context */ moveli r4, hw1_last(swapper_pgprot - PAGE_OFFSET) } { @@ -131,19 +140,14 @@ ENTRY(_start) shl16insli r0, r0, hw0(MEM_SV_START) mtspr SPR_INTERRUPT_VECTOR_BASE_K, r0 - /* - * Get our processor number and save it away in SAVE_K_0. - * Extract stuff from the topology structure: r4 = y, r6 = x, - * r5 = width. FIXME: consider whether we want to just make these - * 64-bit values (and if so fix smp_topology write below, too). - */ + /* Get our processor number and save it away in SAVE_K_0. */ jal hv_inquire_topology { - v4int_l r5, zero, r1 /* r5 = width */ - shrui r4, r0, 32 /* r4 = y */ + GET_FIRST_INT(r5, r1) /* r5 = width */ + GET_SECOND_INT(r4, r0) /* r4 = y */ } { - v4int_l r6, zero, r0 /* r6 = x */ + GET_FIRST_INT(r6, r0) /* r6 = x */ mul_lu_lu r4, r4, r5 } { |