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A structure, system_config, which is dynamically defined by the definitions/sysconf.yaml config, is now mapped into every user address space. The kernel fills this with information about itself and the running machine. User programs access this through the new j6_sysconf fake syscall in libj6. See: Github bug #242 See: [frobozz blog post](https://jsix.dev/posts/frobozz/) Tags:
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
#include <string.h>
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#include "assert.h"
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#include "cpu.h"
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#include "frame_allocator.h"
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#include "memory.h"
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#include "sysconf.h"
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struct kheader
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{
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uint64_t magic;
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uint16_t header_len;
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uint16_t header_version;
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uint16_t version_major;
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uint16_t version_minor;
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uint16_t version_patch;
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uint16_t _reserved;
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uint32_t version_gitsha;
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uint64_t flags;
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};
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extern kheader _kernel_header;
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system_config *g_sysconf = nullptr;
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uintptr_t g_sysconf_phys = 0;
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constexpr size_t sysconf_pages = mem::bytes_to_pages(sizeof(system_config));
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void
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sysconf_create()
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{
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auto &fa = frame_allocator::get();
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size_t count = fa.allocate(sysconf_pages, &g_sysconf_phys);
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kassert(count == sysconf_pages,
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"Could not get enough contiguous pages for sysconf");
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g_sysconf = mem::to_virtual<system_config>(g_sysconf_phys);
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memset(g_sysconf, 0, sysconf_pages * mem::frame_size);
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g_sysconf->kernel_version_major = _kernel_header.version_major;
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g_sysconf->kernel_version_minor = _kernel_header.version_minor;
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g_sysconf->kernel_version_patch = _kernel_header.version_patch;
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g_sysconf->kernel_version_gitsha = _kernel_header.version_gitsha;
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g_sysconf->sys_page_size = mem::frame_size;
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g_sysconf->sys_large_page_size = 0;
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g_sysconf->sys_huge_page_size = 0;
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g_sysconf->sys_num_cpus = g_num_cpus;
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}
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