arm-trusted-firmware

Masahiro Yamada 3cde15fade xlat_tables_v2: use get_current_el_maybe_constant() in is_dcache_enabled() Using get_current_el_maybe_constant() produces more optimized code because in most cases, we know the exception level at build-time. For example, BL31 runs at EL3, so unneeded code will be trimmed. [before] 0000000000000000 <is_dcache_enabled>: 0: d5384240 mrs x0, currentel 4: 53020c00 ubfx w0, w0, #2, #2 8: 7100041f cmp w0, #0x1 c: 54000081 b.ne 1c <is_dcache_enabled+0x1c> // b.any 10: d5381000 mrs x0, sctlr_el1 14: 53020800 ubfx w0, w0, #2, #1 18: d65f03c0 ret 1c: 7100081f cmp w0, #0x2 20: 54000061 b.ne 2c <is_dcache_enabled+0x2c> // b.any 24: d53c1000 mrs x0, sctlr_el2 28: 17fffffb b 14 <is_dcache_enabled+0x14> 2c: d53e1000 mrs x0, sctlr_el3 30: 17fffff9 b 14 <is_dcache_enabled+0x14> [after] 0000000000000000 <is_dcache_enabled>: 0: d53e1000 mrs x0, sctlr_el3 4: 53020800 ubfx w0, w0, #2, #1 8: d65f03c0 ret Change-Id: I3698fae9b517022ff9fbfd4cad3a320c6e137e10 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>	5 years ago
..
enable_mmu.S	xlat v2: Fix comment	6 years ago
xlat_tables_arch.c	xlat_tables_v2: use get_current_el_maybe_constant() in is_dcache_enabled()	5 years ago

Masahiro Yamada 3cde15fade xlat_tables_v2: use get_current_el_maybe_constant() in is_dcache_enabled()

Using get_current_el_maybe_constant() produces more optimized code
because in most cases, we know the exception level at build-time.
For example, BL31 runs at EL3, so unneeded code will be trimmed.

[before]

0000000000000000 <is_dcache_enabled>:
   0:   d5384240        mrs     x0, currentel
   4:   53020c00        ubfx    w0, w0, #2, #2
   8:   7100041f        cmp     w0, #0x1
   c:   54000081        b.ne    1c <is_dcache_enabled+0x1c>  // b.any
  10:   d5381000        mrs     x0, sctlr_el1
  14:   53020800        ubfx    w0, w0, #2, #1
  18:   d65f03c0        ret
  1c:   7100081f        cmp     w0, #0x2
  20:   54000061        b.ne    2c <is_dcache_enabled+0x2c>  // b.any
  24:   d53c1000        mrs     x0, sctlr_el2
  28:   17fffffb        b       14 <is_dcache_enabled+0x14>
  2c:   d53e1000        mrs     x0, sctlr_el3
  30:   17fffff9        b       14 <is_dcache_enabled+0x14>

[after]

0000000000000000 <is_dcache_enabled>:
   0:   d53e1000        mrs     x0, sctlr_el3
   4:   53020800        ubfx    w0, w0, #2, #1
   8:   d65f03c0        ret

Change-Id: I3698fae9b517022ff9fbfd4cad3a320c6e137e10
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

5 years ago

enable_mmu.S

xlat v2: Fix comment

6 years ago

xlat_tables_arch.c

xlat_tables_v2: use get_current_el_maybe_constant() in is_dcache_enabled()

5 years ago