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author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:09:50 -0800 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:21:03 -0800 |
commit | 71e4f3812982dba2efb471283d310224e8db363e (patch) | |
tree | ea111a1acb8b8845dbda39c0e1b4bac1d198143b /linux/402time.mu | |
parent | c6b928be29ac8cdb4e4d6e1eaa20420ff03e5a4c (diff) | |
download | mu-71e4f3812982dba2efb471283d310224e8db363e.tar.gz |
7842 - new directory organization
Baremetal is now the default build target and therefore has its sources at the top-level. Baremetal programs build using the phase-2 Mu toolchain that requires a Linux kernel. This phase-2 codebase which used to be at the top-level is now under the linux/ directory. Finally, the phase-2 toolchain, while self-hosting, has a way to bootstrap from a C implementation, which is now stored in linux/bootstrap. The bootstrap C implementation uses some literate programming tools that are now in linux/bootstrap/tools. So the whole thing has gotten inverted. Each directory should build one artifact and include the main sources (along with standard library). Tools used for building it are relegated to sub-directories, even though those tools are often useful in their own right, and have had lots of interesting programs written using them. A couple of things have gotten dropped in this process: - I had old ways to run on just a Linux kernel, or with a Soso kernel. No more. - I had some old tooling for running a single test at the cursor. I haven't used that lately. Maybe I'll bring it back one day. The reorg isn't done yet. Still to do: - redo documentation everywhere. All the README files, all other markdown, particularly vocabulary.md. - clean up how-to-run comments at the start of programs everywhere - rethink what to do with the html/ directory. Do we even want to keep supporting it? In spite of these shortcomings, all the scripts at the top-level, linux/ and linux/bootstrap are working. The names of the scripts also feel reasonable. This is a good milestone to take stock at.
Diffstat (limited to 'linux/402time.mu')
-rw-r--r-- | linux/402time.mu | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/linux/402time.mu b/linux/402time.mu new file mode 100644 index 00000000..fdb98c81 --- /dev/null +++ b/linux/402time.mu @@ -0,0 +1,43 @@ +type timespec { + tv_sec: int + tv_nsec: int +} + +# return time in seconds since epoch +# TODO: y2038 +fn time -> _/eax: int { + var t: timespec + var clock/ebx: int <- copy 0/CLOCK_MONOTONIC + var t-addr/ecx: (addr timespec) <- address t + syscall_clock_gettime + var t-secs-addr/ecx: (addr int) <- get t-addr, tv_sec + var secs/eax: int <- copy *t-secs-addr + return secs +} + +# return time in nanoseconds since epoch +fn ntime -> _/eax: int { + var t: timespec + var clock/ebx: int <- copy 0/CLOCK_MONOTONIC + var t-addr/ecx: (addr timespec) <- address t + syscall_clock_gettime + var t-nsecs-addr/ecx: (addr int) <- get t-addr, tv_nsec + var nsecs/eax: int <- copy *t-nsecs-addr + return nsecs +} + +# nsecs must be less than 999999999 or 0x3b9ac9ff nanoseconds +fn sleep secs: int, nsecs: int { + var t: timespec + # initialize t + var tmp/eax: (addr int) <- get t, tv_sec + var tmp2/ecx: int <- copy secs + copy-to *tmp, tmp2 + tmp <- get t, tv_nsec + tmp2 <- copy nsecs + copy-to *tmp, tmp2 + # perform the syscall + var t-addr/ebx: (addr timespec) <- address t + var rem-addr/ecx: (addr timespec) <- copy 0 + syscall_nanosleep +} |