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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:
45 lines
926 B
C++
45 lines
926 B
C++
// vim: ft=cpp
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// The kernel depends on libj6 for some shared code,
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// but should not include the user-specific code.
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#ifndef __j6kernel
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#include <j6/sysconf.h>
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/*[[[cog code generation
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from os.path import join
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from sysconf import Sysconf
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sc = Sysconf(join(definitions_path, "sysconf.yaml"))
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cog.outl(f"constexpr uintptr_t __sysconf_address = {sc.address:#x};")
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]]]*/
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///[[[end]]]
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struct __system_config
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{
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/*[[[cog code generation
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for var in sc.vars:
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cog.outl(f"{var.type:10} {var.section}_{var.name};")
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]]]*/
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///[[[end]]]
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};
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unsigned long
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j6_sysconf(j6_sysconf_arg arg)
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{
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__system_config &sc =
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* reinterpret_cast<__system_config*>(__sysconf_address);
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switch (arg) {
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/*[[[cog code generation
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for var in sc.vars:
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cog.outl(f"case j6sc_{var.name}: return sc.{var.section}_{var.name};")
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]]]*/
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///[[[end]]]
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default: return 0;
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}
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}
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#endif // __j6kernel
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