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Use std::span for CPU register-state

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Following the trend of #33: `std::span` provides some useful utility
functions like `size_bytes()` and `as_bytes()` and serves as a better
non-owning "chunk of data"-type over just passing around an
`std::array&`.
This commit is contained in:
Wunkolo 2023-06-16 07:24:34 -07:00
parent c6f5d19983
commit fde93381a5
5 changed files with 38 additions and 32 deletions
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24
src/core/kernel/threads.cpp
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@ -1,8 +1,10 @@
#include <cassert>
#include <cstring>
#include "kernel.hpp"
#include "arm_defs.hpp"
// This header needs to be included because I did stupid forward decl hack so the kernel and CPU can both access each other
#include "kernel.hpp"
// This header needs to be included because I did stupid forward decl hack so the kernel and CPU can both access each
// other
#include "cpu.hpp"
#include "resource_limits.hpp"
@ -20,17 +22,17 @@ void Kernel::switchThread(int newThreadIndex) {
}
// Backup context
std::memcpy(&oldThread.gprs[0], &cpu.regs()[0], 16 * sizeof(u32)); // Backup the 16 GPRs
std::memcpy(&oldThread.fprs[0], &cpu.fprs()[0], 32 * sizeof(u32)); // Backup the 32 FPRs
oldThread.cpsr = cpu.getCPSR(); // Backup CPSR
oldThread.fpscr = cpu.getFPSCR(); // Backup FPSCR
std::memcpy(oldThread.gprs.data(), cpu.regs().data(), cpu.regs().size_bytes()); // Backup the 16 GPRs
std::memcpy(oldThread.fprs.data(), cpu.fprs().data(), cpu.fprs().size_bytes()); // Backup the 32 FPRs
oldThread.cpsr = cpu.getCPSR(); // Backup CPSR
oldThread.fpscr = cpu.getFPSCR(); // Backup FPSCR
// Load new context
std::memcpy(&cpu.regs()[0], &newThread.gprs[0], 16 * sizeof(u32)); // Load 16 GPRs
std::memcpy(&cpu.fprs()[0], &newThread.fprs[0], 32 * sizeof(u32)); // Load 32 FPRs
cpu.setCPSR(newThread.cpsr); // Load CPSR
cpu.setFPSCR(newThread.fpscr); // Load FPSCR
cpu.setTLSBase(newThread.tlsBase); // Load CP15 thread-local-storage pointer register
std::memcpy(cpu.regs().data(), newThread.gprs.data(), cpu.regs().size_bytes()); // Load 16 GPRs
std::memcpy(cpu.fprs().data(), newThread.fprs.data(), cpu.fprs().size_bytes()); // Load 32 FPRs
cpu.setCPSR(newThread.cpsr); // Load CPSR
cpu.setFPSCR(newThread.fpscr); // Load FPSCR
cpu.setTLSBase(newThread.tlsBase); // Load CP15 thread-local-storage pointer register
currentThreadIndex = newThreadIndex;
}