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hw: enable branch predictor on rpi

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* Z-bit was never enabled for rpi1
* Write buffer, and TCM bits are deprecated in this processor generation
  so do not use them

Ref #3247
This commit is contained in:
Stefan Kalkowski 2020-06-17 15:23:31 +02:00 committed by Norman Feske
parent b11da67679
commit 04d8c859d8
1 changed files with 10 additions and 17 deletions
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27
repos/base-hw/src/bootstrap/spec/rpi/platform.cc
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@ -39,23 +39,7 @@ unsigned Bootstrap::Platform::enable_mmu()
{
using ::Board::Cpu;
struct Sctlr : Cpu::Sctlr
{
struct W : Bitfield<3,1> { }; /* enable write buffer */
struct Dt : Bitfield<16,1> { }; /* global data TCM enable */
struct It : Bitfield<18,1> { }; /* global instruction TCM enable */
struct U : Bitfield<22,1> { }; /* enable unaligned data access */
struct Xp : Bitfield<23,1> { }; /* disable subpage AP bits */
};
Cpu::Sctlr::init();
Cpu::Sctlr::access_t sctlr = Cpu::Sctlr::read();
Sctlr::W::set(sctlr, 1);
Sctlr::Dt::set(sctlr, 1);
Sctlr::It::set(sctlr, 1);
Sctlr::U::set(sctlr, 1);
Sctlr::Xp::set(sctlr, 1);
Cpu::Sctlr::write(sctlr);
Cpu::Cpsr::init();
@ -82,9 +66,18 @@ unsigned Bootstrap::Platform::enable_mmu()
Cpu::Ttbr0::write(ttbr);
Cpu::Ttbr1::write(ttbr);
sctlr = Cpu::Sctlr::read();
struct Sctlr : Cpu::Sctlr
{
struct U : Bitfield<22,1> { }; /* enable unaligned data access */
struct Xp : Bitfield<23,1> { }; /* disable subpage AP bits */
};
Cpu::Sctlr::access_t sctlr = Cpu::Sctlr::read();
Cpu::Sctlr::C::set(sctlr, 1);
Cpu::Sctlr::I::set(sctlr, 1);
Sctlr::U::set(sctlr, 1);
Sctlr::Xp::set(sctlr, 1);
Cpu::Sctlr::Z::set(sctlr, 1);
Cpu::Sctlr::M::set(sctlr, 1);
Cpu::Sctlr::write(sctlr);